Complex sentence: When he was fifteen he started his first band, a Ramones cover group called Endless Vacation, which played shows in his parents' living room, and performed shows for donations to repair the halfpipe.
Split into simpler sentences: When he was fifteen he started his first band, a Ramones cover group called Endless Vacation, which played shows in his parents' living room. They also performed shows for donations to repair the halfpipe.