Complex sentence: The bridge is south of Stockton-on-Tees town centre and adjacent to the Surtees Bridge on the A66 road--and in some sources is referred to as the Surtees Rail Bridge.
Split into simpler sentences: The bridge is south of Stockton-on-Tees town centre and adjacent to the Surtees Bridge carrying the A66 road. In some sources it is referred to as the Surtees Rail Bridge.