Complex sentence: Activated as a B-26 Marauder medium bombardment squadron in late 1942, it trained under the Third Air Force and deployed to the European Theater of Operations (ETO) in July 1943.
Split into simpler sentences: Activated as a B-26 Marauder medium bombardment squadron in late 1942. Trained under Third Air Force and deployed to European Theater of Operations (ETO) in July 1943.