Complex sentence: There is a single island platform between the two tracks, which end just north of the platform; to the south is a double crossover that allows trains to get to the correct track, and then two tracks from the 207th Street Yard come into the middle.
Split into simpler sentences: There is a single island platform between the two tracks, which end just north of the platform. To the south is a double crossover that allows trains to get to the correct track, and then two tracks from the 207th Street Yard come into the middle.