Complex sentence: The Canadian National Railway (CNR) took over the station in 1923, when they absorbed the Grand Trunk Railway, which they closed for train service in 1932 and demolished the building in 1974.
Split into simpler sentences: The Canadian National Railway (CNR) took over the station in 1923, when they absorbed the Grand Trunk Railway. CNR discontinued passenger train service at the station in 1932 and demolished the building in 1974.