Complex sentence: He was a key member of Soda and his Million Piece Band and played mandolin and saxophone, and their music was featured prominently in the soundtrack for the film Waitress (2007) directed by the late Adrienne Shelly.
Split into simpler sentences: He was a key member of Soda and his Million Piece Band, playing mandolin and saxophone with the group. Their their music was featured in the soundtrack for the film Waitress (2007) directed by the late Adrienne Shelly.