Complex sentence: A water tank was once located at the top of the rock to release water (denoting the Ganges River) to cascade over the cleft and the relief to give the impression of the Ganga descending from the head tied hair matts of Shiva.
Split into simpler sentences: A water tank was once located at the top of the rock to release water denoting the Ganges River. It cascaded over the cleft and the relief to give the impression of the Ganga descending from the head tied matts of Shiva.