Complex sentence: Between the side platform and the island platform there are two parallel rail tracks, and an additional track to the west of platform 3, there are several additional free tracks to the west of the station in use by freight trains.
Split into simpler sentences: Between the side platform and the island platform, there are two parallel rail tracks, and an additional track to the west of platform 3. There are also several free tracks to the west of the station used by freight trains.