Complex sentence: Prouty Place State Park, a picnic area to the northwest in Potter County, is also only, and only Sand Bridge State Park (another picnic area, to the south in Union County) is smaller, at.
Split into simpler sentences: Prouty Place State Park, a picnic area to the northwest in Potter County, is also. Only Sand Bridge State Park, another picnic area to the south in Union County, is smaller, at.