Complex sentence: Formed by the Hoover Dam, Lake Mead is long when the lake is full and at its greatest depth, and has of shoreline, a surface elevation of above sea level, of surface, and when filled to available capacity, of water.
Split into simpler sentences: Formed by the Hoover Dam, Lake Mead is long when the lake is full and at its greatest depth. It has of shoreline, a surface elevation of above sea level, of surface, and when filled to available capacity, of water.