Complex sentence: The Sakonnet Bridge connects Portsmouth and Tiverton near it's northmost end, a small uninhabited island, Gould Island, where it widens as it meets the sea, and a lighthouse at the very southern end of the river called Sakonnet Point Light.
Split into simpler sentences: The Sakonnet Bridge connects Portsmouth and Tiverton near it's northmost end. There a small uninhabited island, Gould Island, where it widens as it meets the sea, and a lighthouse at the very southern end of the river called Sakonnet Point Light.