Complex sentence: He was an opera director from about 1960 onwards, and is most well-known for being the General Director of the Canadian Opera Company and of the San Francisco Opera from 1988 through 2001.
Split into simpler sentences: He was an opera director from about 1960 onwards. He is most well-known for being the General Director of the Canadian Opera Company and of the San Francisco Opera from 1988 through 2001.