Sri Bhashyakara
Brahman (Vishnu/Narayana) is one but qualified by an inner body of sentient (chit) and insentient (achit) reality. You are real, distinct, yet eternally inseparable from Him.
God, soul, and matter are all real and ontologically distinct, yet the souls and matter constitute the body of God — they are inseparable from Him as a wave from the ocean. Liberation comes through prapatti (loving surrender) and bhakti directed at Sriman Narayana, with Lakshmi as the divine mediatrix. Every soul is eligible — Ramanuja famously climbed the Tirupati hill and shouted the Ashtakshari mantra to all castes, breaking the priestly monopoly.
The Sri Vaishnava Sampradaya splits into two sub-schools after him: Vadakalai (northern, more Sanskrit-leaning, headquartered at Kanchi) and Tenkalai (southern, more Tamil-leaning, headquartered at Srirangam). The Ramanuja Mission and many Iyengar temples continue the tradition.