Complex sentence: As a teenager Guy was absorbed in the music of Beethoven, Chopin, Schumann, Liszt, Brahms, and Debussy, yet also sang and played bass guitar and keyboards in local combos.
Split into simpler sentences: As a teenager Guy was absorbed in the music of Beethoven, Chopin, Schumann, Liszt, Brahms, and Debussy. He also sang and played bass guitar and keyboards in local combos.