Complex sentence: In the 1950s, the city centre shifted to the west when the interurban rail line through the DTES closed, and its theatres and shops moved towards Granville and Robson Streets.
Split into simpler sentences: In the 1950s, the city centre shifted to the west when the interurban rail line through the DTES closed. Theatres and shops moved towards Granville and Robson Streets.