Complex sentence: The bridge is located at, between the Dutton Locks and Dutton Viaduct, and carries the towpath across the weir stream at the point where it rejoins the main river.
Split into simpler sentences: The bridge is located at, between the Dutton Locks and Dutton Viaduct. It carries the towpath bridleway across a subsidiary channel used to regulate the water level, at the point where it rejoins the main river.