Complex sentence: Isherwood, an established author with works such as The Berlin Stories and most notably Cabaret, helped Bachardy discover and develop his affinity for drawing and painting as he became a renowned portrait painter during the second half of the 20th century to the present.
Split into simpler sentences: Isherwood, an already established author with works such as The Berlin Stories and most notably Cabaret. He helped Bachardy discover and develop his affinity for drawing and painting, eventually becoming a renowned portrait painter during the second half of the 20th century to the present.