Complex sentence: His organ and harpsichord teachers were Charles Courboin, Virgil Fox, E. Power Biggs, and Ernest White, and Gustav Leonhardt; his conducting teachers were Robert Shaw, G. Wallace Woodworth, William Ifor Jones, and Anthon van der Horst.
Split into simpler sentences: His organ and harpsichord teachers were Charles Courboin, Virgil Fox, E. Power Biggs, Ernest White, and Gustav Leonhardt. He studied conducting with Robert Shaw, G. Wallace Woodworth, William Ifor Jones, and Anthon van der Horst.