Complex sentence: The hydroelectric plant, operated by the AmerenUE electric company, is designed to help meet peak power demands during the day by generating electricity from water flowing down from a reservoir on top of Proffit Mountain to a lower reservoir on the East Fork of the Black River.
Split into simpler sentences: The hydroelectric plant, operated by the AmerenUE electric company, is designed to help meet peak power demands during the day. Electrical generators are turned by water flowing from a reservoir on top of Proffit Mountain into a lower reservoir on the East Fork of the Black River.