Complex sentence: In 1621-22, due to some feuds with prominent Mantuans, he moved to Venice, which for the first few decades of the 17th century had persisted in mainly sponsoring Mannerist styles as epitomized by Palma the Younger and the successors of Tintoretto and Veronese.
Split into simpler sentences: In 1621-22, he moved to Venice, due to some feuds with prominent Mantuans. Venice had persisted for the first few decades of the 17th century in mainly sponsoring Mannerist styles as epitomized by Palma the Younger and the successors of Tintoretto and Veronese.