Complex sentence: Orient Heights is one of the few Blue Line stations in East Boston that has not been rebuilt; nevertheless, its two platforms sit on either side of two central tracks and are connected by a mezzanine walkway to facilitate changing directions without paying an extra fare.
Split into simpler sentences: Orient Heights is one of the few Blue Line stations in East Boston that has not been rebuilt. Its two platforms sit on either side of two central tracks and are connected by a mezzanine walkway to facilitate changing directions without paying an extra fare.