Complex sentence: Lake Hico is a cooling pond reservoir built on 16th section school land in Jackson, Mississippi, in 1950's, to provide water for the Rex Brown Plant, which generates electricity with steam.
Split into simpler sentences: Lake Hico is a cooling pond reservoir built on 16th section school land in Jackson, Mississippi, in the 1950's. It's primary purpose is to provide water for the adjacent Rex Brown Plant, which generates electricity with steam.