Complex sentence: Battlefield Drums is an avid endorser of Christian bands due to it being founded and run by devout Christians, but also endorses several Non-Christian bands such as Beat Union and Oreskaband.
Split into simpler sentences: Battlefield Drums is an avid endorser of Christian bands due to it being founded and run by devout Christians. However, Battlefield Drums has als been known to endorse non-Christian bands such as Beat Union and Oreskaband.