Complex sentence: In 2008, Stern collaborated with the Yellowjackets for their "Lifecycle" release, contributing two compositions and performing on most of the tracks; he toured with the Yellowjackets for much of 2008 and 2009.
Split into simpler sentences: In 2008, he collaborated with the Yellowjackets for their "Lifecycle" release, contributing two compositions and performing on most of the tracks. He toured with the Yellowjackets for much of 2008 and 2009.