Complex sentence: In late June 2009, drummer Jason Costa broke his hand, so the band temporarily recruited drummer Tony Laureano (Dimmu Borgir, Nile) to honor their commitment to the 2009 Rockstar Energy Mayhem Festival.
Split into simpler sentences: In late June 2009, drummer Jason Costa broke his hand. The band temporarily recruited drummer Tony Laureano (Dimmu Borgir, Nile) to honor their commitment to the 2009 Rockstar Energy Mayhem Festival.