Complex sentence: He is said to have worked in the Campo Santo at Pisa, and at the Palazzo del Ceppo in Prato, as well as in the church of San Domenico, Pistoia.
Split into simpler sentences: He is said to have worked in the Campo Santo at Pisa. He also worked at the Palazzo del Ceppo in Prato, as well as in the church of San Domenico, Pistoia.