Complex sentence: Today, the westernmost ("southbound ") platform remains in operation; the two"southbound " tracks provide service, with southbound traffic using the"local " track and northbound traffic using the"express" track.
Split into simpler sentences: Today, the westernmost (former "southbound") platform remains in operation. Both tracks provide through service, with southbound traffic using the former southbound "local" track and northbound traffic using the former southbound "express" track.