Complex sentence: This problem was an issue of fatigue on the prop shaft of the propeller to the engine, an instance of which the propeller itself actually detaches and flies off in flight, of with Quill himself was a surviving victim to.
Split into simpler sentences: This problem was an issue of fatigue on the prop shaft of the propeller to the engine. An instance of which the propeller itself actually detaches and flies off in flight, of with Quill himself was a surviving victim to.