Complex sentence: At the top of the valley the road reaches its highest point a little below, then the road then descends into part of a similar valley created by the Murrumbidgee River as it passes by the access roads for Yarrangobilly Caves.
Split into simpler sentences: At the top of the valley the road reaches its highest point a little below. The road then descends into part of a similar valley created by the Murrumbidgee River as it passes by the access roads for Yarrangobilly Caves.