Complex sentence: He is also a former member of Reel Big Fish trumpet player, Scott Klopfenstein's side project, The Littlest Man Band, playing trumpet, but left in 2004 to pursue an education and focus on Suburban Legends.
Split into simpler sentences: He is also a former member of Reel Big Fish trumpet player, Scott Klopfenstein's side project, The Littlest Man Band. Vince had played trumpet, but left in 2004 to pursue an education and focus on Suburban Legends.