Complex sentence: Born as Vitthalācharya, he studied Vedanta, Mimamsa and Nyaya under the philosopher Vyasatirtha until, aged 25, he moved to Kumbakonam at the behest of Surendra Tirtha, eventually succeeding him as the pontiff.
Split into simpler sentences: Born as Vitthalācharya, he studied Vedanta, Mimamsa and Nyaya under the philosopher Vyasatirtha. Aged 25, he moved to Kumbakonam at the behest of Surendra Tirtha, eventually succeeding him as the pontiff.