Complex sentence: He went back to Toronto worked on a TV pop musical variety show for a couple years then ended up working with Gary Peterson (drummer for the Guess Who) whom was working with an R&B band out of Philidelphia.
Split into simpler sentences: He went back to Toronto and worked on a TV pop musical variety show for a couple years. He then worked with Gary Peterson (drummer for The Guess Who) whom was working with an R&B band out of Philidelphia.