Complex sentence: Immediately to the north of the engine shed is a small stream, and a section of the stream was lined with slate and a wooden dunny or latrine built over it to provide toilet facilities with constant running water.
Split into simpler sentences: Immediately to the north of the engine shed is a small stream. At an unknown date a section of the stream was lined with slate and a wood-framed dunny or latrine built over it to provide toilet facilities with constant running water.