Complex sentence: Amtrak, the national passenger rail system, provides service to Rensselaer, to Albany, the state capital, and to nearby Troy, through a station designated in the Amtrak timetable as Albany-Rensselaer.
Split into simpler sentences: Amtrak, the national passenger rail system, provides service to Rensselaer through the Albany-Rensselaer Rail Station. The station also serves Albany, the state capital, and Troy, and it is designated in the Amtrak timetable as Albany-Rensselaer.