Complex sentence: The station was listed on the National Register of Historic Places in 1974, although it continued to serve as an Amtrak station until 1981, when the 400-ton station was moved about 50 meters to the south to make way for the Rockville Metro station.
Split into simpler sentences: The station was listed on the National Register of Historic Places in 1974. In 1981, the 400-ton station was moved about 50 meters to the south to make way for the Rockville Metro station.