Complex sentence: Stewart was the founder of the guitar program at Dick Grove Music Workshops and was chairman of the Music Department at the Audio/Video Institute of Technology in Hollywood, US, conducting master classes in record production and music recording history.
Split into simpler sentences: Stewart was the founder of the guitar program at Dick Grove Music Workshops. He was chairman of the Music Department at the Audio/Video Institute of Technology in Hollywood, conducting master classes in record producing and music recording history.