Complex sentence: He was a serf of the Pafnutievo-Borovsky Monastery, and learnt the art of portrait painting from Ivan Nikitich Nikitin and Louis Caravaque; he also studied icon painting with Vasily Vasilevsky.
Split into simpler sentences: He was a serf of the Pafnutievo-Borovsky Monastery. He learnt the art of the portrait painting from Ivan Nikitich Nikitin, Louis Caravaque and the icon-painting from Vasily Vasilevsky.