Complex sentence: There, he studied classical Greek and Roman art and copied works of the Italian masters; the Hellenistic sculpture "Laocoön and his Sons" was especially influential on him, as was the art of Michelangelo, Raphael, and Leonardo da Vinci.
Split into simpler sentences: There, he studied classical Greek and Roman art and copied works of the Italian masters. The Hellenistic sculpture "Laocoön and his Sons" was especially influential on him, as was the art of Michelangelo, Raphael, and Leonardo da Vinci.