Complex sentence: The Pratt & Whitney JT3D is an early turbofan engine derived from the Pratt & Whitney JT3C turbojet it was first run in 1958 and was first flown in 1959 under a B-45 Tornado test aircraft.
Split into simpler sentences: The Pratt & Whitney JT3D is an early turbofan engine derived from the Pratt & Whitney JT3C turbojet. It was first run in 1958 and was first flown in 1959 under a B-45 Tornado test aircraft.