Complex sentence: In 2003, he took on full time drumming duties for Moral Crux, who were on (Lookout! Records) at the time, but departed in 2005 due to personal reasons.
Split into simpler sentences: In 2003, he took on full time drumming duties for Moral Crux, who were on Lookout! Records at the time, but departed in 2005 due to personal reasons.