Complex sentence: Jerome joined the Louisiana-based band Better Than Ezra in 2009, following the departure of the band's drummer of 13 years, Travis McNabb, who had amicably left Better Than Ezra in February 2009 in order to tour full-time with Sugarland.
Split into simpler sentences: Jerome joined the Louisiana-based band, Better Than Ezra in 2009, following the departure of the band's drummer of 13 years, Travis McNabb. McNabb had amicably left Better Than Ezra in February 2009 in order to tour full-time with Sugarland.