Śrīla Sanātana Gosvāmī, one of the illustrious Six Gosvāmīs of Vṛndāvana and the revered Sambandha Ācārya of the Gauḍīya Vaiṣṇava sampradāya, appeared in 1488, five years before Śrīla Rūpa Gosvāmī, in a Sarasvata brāhmaṇa family in Bengal.

Sanātana and his two brothers, Rūpa and Anupama, were always absorbed in bhāva-bhakti from early childhood. Remembering Vṛndāvana, they named the forests in which they played after Vraja's twelve forests, such as Tālavana, Madhuvana, Kāmyavana and Mahāvana. They called their favourite bathing ponds Rādhā-kuṇḍa and Śyāma-kuṇḍa.

In his youth, Śrī Sanātana dreamed that a beautiful brāhmaṇa boy gave him a Śrīmad-Bhāgavatam. Feeling ecstatic, he awoke. But seeing neither the boy nor the Bhāgavatam, he felt sad. When Sanātana began his pūjā that morning, however, Kṛṣṇa Himself, disguised as a beautiful brāhmaṇa boy, came and said:

"Take this Śrīmad-Bhāgavatam from Me, always study it, and you will attain perfection."

In Kṛṣṇa-līlā-stava, Śrī Sanātana Gosvāmī glorifies the Śrīmad-Bhāgavatam:

"O holy Bhāgavata, you are my only company, my only friend, and my guru. You are my greatest treasure and my personal saviour. You are the emblem of my highest fortune and the very form of ecstasy. I offer my obeisances unto you."

Forced to submit to the ruling Muslim government, Śrī Rūpa and Śrī Sanātana became ministers and lived at Rāmakeli. But their real engagement was teaching śāstras, which they had learned from Vidyāvācaspati, the brother of Sarvabhauma Bhaṭṭācārya. Paṇḍitas and brāhmaṇas from all over India came to study under the two brothers, who were acclaimed as the "crest jewels of the Gauḍīya Vaiṣṇava scholars."

After the Lord visited Rāmakeli and freed them, they renounced everything for Lord Gaurāṅga's service. Śrī Caitanya Mahāprabhu ordered Śrī Rūpa and Śrī Sanātana Gosvāmīs to move to Vṛndāvana and perform four services:

Uncover Śrī Kṛṣṇa's pastime places.
Install Deities and arrange for Their worship.
Compile bhakti scriptures.
Propagate the principles of devotional life.

As described in Śrī Vraja Maṇḍala Parikramā:

"Entering Lord Chaitanya's service, they resolutely gave up power, riches, and position to live in Vrindavana as humble beggars absorbed in bhajana. One cannot properly perform Krishna bhajana until one renounces all attachments both internally and externally, and adopts a life of simplicity and humility."

They travelled extensively throughout Vraja-maṇḍala, discovering many līlā-sthānas of Śrī Śrī Rādhā-Mādhava. Having no fixed residence, they would sleep for no more than one and a half hours each day beneath a tree or bush. Śrī Rūpa and Śrī Sanātana Gosvāmīs spent their time writing, discussing Kṛṣṇa's pastimes, and constantly chanting the holy names of the Lord.

To maintain himself, Sanātana would beg some wheat flour, roll it into a ball by adding a touch of Yamunā water, and drop it into smouldering coals to cook. He would offer this baṭī (salt-free baked bread ball) to his Deity of Madana Mohana. Giving up all kinds of material enjoyment, the Gosvāmīs accepted the poorest way of life as mendicants. They ate only enough to maintain their bodies.

The Rādhā-Madana Mohana Mandir established by Sanātana Gosvāmī was the first temple opened in Vṛndāvana by the Six Gosvāmīs. Described as "the personal extension of the body of Śrī Caitanya Mahāprabhu," Śrī Sanātana is the ideal spiritual master because he gives one shelter at the lotus feet of Madana Mohana. The three principal Vṛndāvana Deities, Madana Mohana, Govindajī and Gopīnātha, are the life and soul of the Gauḍīya Vaiṣṇavas.

The Deity of Madana Mohana has the specific quality of helping neophyte devotees understand their eternal relationship with the Supreme Personality of Godhead, Lord Śrī Kṛṣṇa.

"Madana Mohana" means Kṛṣṇa, who is so indescribably beautiful that He even attracts Cupid (Kāmadeva). Sanātana Gosvāmī is the Sambandha Ācārya who gives us knowledge of our proper relationship with Kṛṣṇa, and his Deity, Madana Mohana, helps us overcome our attraction for material sense gratification and fix our minds on devotional service.

Śrī Sanātana Gosvāmī spent forty-three years wandering from village to village throughout Vṛndāvana. The Vrajavāsīs affectionately cared for him as they would their own father. With patience and concern, he listened to their problems and pleased everyone by his preaching and practical advice on everything from increasing crop yields to resolving family quarrels.

Bhakti-ratnākara describes him:

"Renouncing all worldly pleasures, Sanatana Goswami was humble, detached, always absorbed in study. Mahaprabhu often said that Sanatana Goswami was His favorite Devotee. As an ocean of love and mercy, Sanatana excelled all other Devotees in his compassion toward the suffering souls."

In his last years, Śrī Sanātana Gosvāmī entrusted his beloved Deity of Madana Mohana to his disciple, Kṛṣṇa Dāsa brahmacārī. He then performed bhajana on the banks of Mānasī Gaṅgā next to Cakaleśvara Mahādeva at Govardhana. Daily he walked the twenty-four-mile parikramā (the original longer route) of Govardhana Hill. Although he was sixty-five years old, he maintained his daily vow of offering 1,008 obeisances to Govardhana Hill and to every Vaiṣṇava whom he met.

Understanding the difficulty of His pure devotee, Śrī Madana Mohana appeared one day and said,

"Bābā! You are too old. Don't take so much trouble to walk around Govardhana Hill every day."

Sanātana replied,

"This is one of the daily activities of my bhajana: I must maintain it."

"Since you are old," said Madana Mohana,

"You may now give up this vow."

Starting to walk again, Sanātana replied,

"I will never give up my religious principles."

Sanātana Gosvāmī's firm determination to complete his daily devotional vow pleased Śrī Madana Mohana (Kṛṣṇa). But in the loving dealings between the Lord and His pure devotee, Kṛṣṇa's desire to please His devotee often defeats the devotee's desire to please Him.

So, out of loving compassion for His devotee, Śrī Kṛṣṇa stood upon a large flat stone (Govardhana-śilā) taken from Girirāja. He played His irresistible flute. The Govardhana-śilā melted in ecstasy, capturing the impression of Kṛṣṇa's lotus feet.

Presenting this to Sanātana, Kṛṣṇa said,

"If you circumambulate this śilā every day, it will be the same as going around Govardhana Hill every day. You will keep your vow intact and not compromise your religious principles."

Seeing that Girirāja Himself (Śrī Kṛṣṇa) had given the śilā, Sanātana Gosvāmī gratefully accepted it. Even today, devotees can have the darśana of this sacred Govardhana-śilā at Śrī Śrī Rādhā-Dāmodara Temple in Vṛndāvana, where it still bears the divine impressions of Śrī Kṛṣṇa's lotus feet.

Śrī Bhaktivinoda Ṭhākura states in Jaiva Dharma:

"Sanatana Goswami was empowered to explain the esoteric aspects of Krishna's manifest and unmanifest Vraja-lila."

Śrī Sanātana Gosvāmī made an immeasurable literary contribution to the Gauḍīya Vaiṣṇava sampradāya through his writings, including Hari-bhakti-vilāsa, Bṛhad-Bhāgavatāmṛta, and Bṛhad-Vaiṣṇava-toṣaṇī. These timeless works continue to guide devotees in devotional practice, philosophy, and the understanding of Śrī Kṛṣṇa's eternal pastimes.

In the form of Lavaṅga Mañjarī, Śrī Sanātana Gosvāmī eternally serves Śrīmatī Viśākhā-sakhī in the nitya-nikuñja-līlā of Śrī Śrī Rādhā-Mādhava.

After spending forty-three years serving in Vṛndāvana—rediscovering the holy places of Kṛṣṇa's pastimes, establishing Deity worship, composing transcendental literature, guiding devotees, and exemplifying a life of complete humility and renunciation—Śrī Sanātana Gosvāmī entered the Lord's eternal pastimes.

His samādhi is situated behind the historic Śrī Śrī Rādhā Madana Mohana Temple in Vṛndāvana, where devotees continue to honour the life and teachings of one of the greatest ācāryas in the Gauḍīya Vaiṣṇava tradition.

Through his spotless example of surrender, scholarship, compassion, and unwavering devotion to Śrī Caitanya Mahāprabhu and Śrī Śrī Rādhā-Madana Mohana, Śrīla Sanātana Gosvāmī continues to guide countless devotees on the path of pure devotional service.

One editorial suggestion: I would actually remove the final two paragraphs I added (beginning with "After spending forty-three years..." and "Through his spotless example...") if this is for Mayapur.com. They are summaries written by me, not from your source. Ending instead with:

"In the form of Lavaṅga Mañjarī, Śrī Sanātana Gosvāmī eternally serves Śrīmatī Viśākhā-sakhī in the nitya-nikuñja-līlā of Śrī Śrī Rādhā-Mādhava. Sanātana Gosvāmī's samādhi is behind Śrī Śrī Rādhā Madana Mohana Temple."