Complex sentence: Wookey Hole cave was formed by the action of the River Axe on the limestone hillsy Hole the water enters underground streams and passes through other caves such as Swildon's Hole and St Cuthbert's Swallet.
Split into simpler sentences: Wookey Hole cave was formed by the action of the River Axe on the limestone hills. Before emerging at Wookey Hole the water enters underground streams and passes through other caves such as Swildon's Hole and St Cuthbert's Swallet.