Complex sentence: Tracks 22 and 31 were removed in the late 1990s to build concourses for Grand Central North, track 12 was removed to expand the platform between tracks 11 and 13, and track 14 is only used for loading a garbage train.
Split into simpler sentences: Tracks 22 and 31 were removed in the late 1990s to build concourses for Grand Central North. Track 12 was removed to expand the platform between tracks 11 and 13 and track 14 is only used for loading a garbage train.