Complex sentence: Model 37C powered by the 420 hp (313 kW) Pratt & Whitney R-1340 Wasp radial piston engine; four built in 1928 for the U.S. Marine Corps as light bombers, fighters and observation aircraft, later redesignated OC-1.
Split into simpler sentences: Model 37C powered by the 420 hp (313 kW) Pratt & Whitney R-1340 Wasp radial piston engine. Four built in 1928 for the U.S. Marine Corps as light bombers, fighters and observation aircraft, later redesignated OC-1.