Complex sentence: He had frequent disagreements with his guru, and eventually left the monastery, propounding his philosophy of dualism, called Dvaita or "Tattvavada", asserting the difference between the soul (Jiva) and the Brahman.
Split into simpler sentences: He had frequent disagreements with his guru, and eventually left the monastery to propound his philosophy, which he called "Tattvavada". The school of thought is also known as Dvaita, implying the difference between the soul (Jiva) and the Brahman.