Complex sentence: He has performed with major symphony orchestras, chamber groups, and avant garde, as well as rock and roll (most notable his work with Tom Waits) and other greats such as Sting and the late Leopold Stokowski (who has conducted Schimmel's music).
Split into simpler sentences: He has performed with major symphony orchestras, chamber groups, and avant-garde groups, as well as rock. His work with Tom Waits is notable, as well as other greats such as Sting and the late Leopold Stokowski (who has conducted Schimmel's music).