Complex sentence: The temple is very sacred to the Vaishnava traditions whose great saint Ramananda was associated with the temples and is of particular significance to followers of the Gaudiya Vaishnavism, whose founder Chaitanya Mahaprabhu had a special attraction to the Jagannath deity and lived in Puri for many years.
Split into simpler sentences: The temple is very sacred to the Vaishnava traditions, of whomn the saint Ramananda was closely associated with the temple. It is also of particular significance to followers of the Gaudiya Vaishnavism, whose founder Chaitanya Mahaprabhu had a special attraction to the Jagannath deity and lived in Puri for many years.