Complex sentence: Barris appeared in 57 films between 1931 and 1950, usually as the pianist during party sequences, and composed songs including "Mississippi Mud", "I Surrender Dear", and "Wrap Your Troubles in Dreams".
Split into simpler sentences: Barris appeared in 57 films between 1931 and 1950, usually as a band member, pianist and/or singer. Offscreen, Barris successfully composed songs including "Mississippi Mud", "I Surrender, Dear", and "Wrap Your Troubles in Dreams".