Complex sentence: The original plan called for the E train to be continued along the right of way of the Atlantic Branch of the Long Island Rail Road through Locust Manor and Laurelton; as the Montauk Branch through St. Albans already provides parallel service to Jamaica.
Split into simpler sentences: The original plan also called for the E train to continue along the right of way of the Atlantic Branch of the Long Island Rail Road through the Locust Manor and Laurelton stations. The Montauk Branch through St. Albans already provides parallel service to Jamaica.