Complex sentence: The White terraces were located at the northern end of Lake Rotomahana and faced the north west end of the lake they descended to the lake edge 40 metres below 280 metres above sea level.
Split into simpler sentences: The White terraces were located at the northern end of Lake Rotomahana and faced the north west end of the lake. They descended to the lake edge 40 metres below 280 metres above sea level.