Complex sentence: East Wansdyke in Wiltshire, on the south of the Marlborough Downs, has been less disturbed by later agriculture and building and remains more clearly traceable on the ground than the western part.
Split into simpler sentences: East Wansdyke in Wiltshire, on the south of the Marlborough Downs, has been less disturbed by later agriculture and building. It is more clearly traceable on the ground than the western part.