Complex sentence: There was also a turntable basin located just behind the engine sheds, formed into the side of the hill with a 30' circular retaining wall on two sides, allowing engines to run in be turned and run out.
Split into simpler sentences: There was also a turntable basin located just behind the engine sheds. Formed into the side of the hill with a 30' circular retaining wall on two sides, allowing engines to run in be turned and run out.