Complex sentence: A new bridge was designed by Mott, Hay and Anderson and built by Mitchell Construction and Dorman Long between 1964 and 1967, slightly to the west of the Chain Bridge, which continued in operation during its construction.
Split into simpler sentences: A new bridge was designed by Mott, Hay and Anderson and built by Mitchell Construction and Dorman Long. It is situated slightly to the west of the Chain Bridge, which continued in operation during its construction.