Complex sentence: The B-17's armament consisted of up to of bombs on two racks in the bomb bay behind the cockpit, and five machine guns, and it was powered by four Pratt & Whitney R-1690 "Hornet" radial engines each producing at.
Split into simpler sentences: The B-17's armament consisted of up to of bombs on two racks in the bomb bay behind the cockpit, and five machine guns. It was powered by four Pratt & Whitney R-1690 "Hornet" radial engines each producing at.