Complex sentence: In 1760, sponsored by Smith and William Allen, reputed to be the wealthiest man in Philadelphia, West traveled to Italy where he expanded his repertoire by copying the works of Italian painters such as Titian and Raphael.
Split into simpler sentences: In 1760, sponsored by Smith and William Allen, reputed to be the wealthiest man in Philadelphia, West traveled to Italy. He expanded his repertoire by copying the works of Italian painters such as Titian and Raphael.