Complex sentence: The Canton River cuts through downtown Canton, Massachusetts tracing down Washington and Neponset Streets (flowing under the Canton Viaduct), and continues down Walpole Street, and is a tributary of the Neponset River, with a few tributaries on the side.
Split into simpler sentences: The Canton River passes through downtown Canton, Massachusetts, tracing down Washington and Neponset Streets (flowing under the Canton Viaduct), and continues down Walpole Street. It is a tributary of the Neponset River, with a few tributaries on the side.