Complex sentence: The El Modena Vanguard Marching Band and Colorguard compete in the AA Gold competition of the California State Band Championships circuit and play their field show every home game during half time.
Split into simpler sentences: The El Modena Vanguard Marching Band and Colorguard is a state-recognized performing ensemble. The band currently competes in AA Gold competition and plays their field show every home game during half time.