Complex sentence: The Sheboygan River also passes through the city, but dams upstream in Sheboygan Falls prevent navigation, while tall-masted boats are confined to the river downstream of the Pennsylvania Avenue bridge.
Split into simpler sentences: The Sheboygan River passes through the city, but dams in Sheboygan Falls prevent navigation upriver. Tall-masted boats are confined to the river downstream of the Pennsylvania Avenue bridge.