Complex sentence: The platforms for the local DC service, numbers 1 and 2, are curved away and apart from the mainline route because the local service loops to the west to serve Watford High Street before Watford Junction.
Split into simpler sentences: The platforms for the local DC service, numbers 1 and 2, are curved away and apart from the mainline route. This is because the local service loops to the west to serve Watford High Street before Watford Junction.