Complex sentence: Prior to joining the band in 2006, He was a recording and touring member for New Jersey alternative rock band New Atlantic from 2004, and also filled in briefly as the drummer for the emo/pop band Tokyo Rose in 2007.
Split into simpler sentences: Prior to joining the band in 2006, He was a recording and touring member for New Jersey alternative rock band New Atlantic from 2004. Mulley also filled in as the drummer for the emo/pop band Tokyo Rose in 2007.