Complex sentence: The shore of Conesus Lake is a shallow gradient, so many communities are located by Conesus Lake, and none are located at Hemlock Lake because the City of Rochester owns the lake and much of the surrounding property.
Split into simpler sentences: The shore of Conesus Lake is a shallow gradient, so many communities are located by Conesus Lake. None are located at Hemlock Lake because the City of Rochester owns the lake and much of the surrounding property.