Complex sentence: Her 1989 work "Bicycle TV" placed the viewer on a bicycle facing a video screenl as the viewer cycled, then controlled their movement through scenes of the Canadaian landscape projected before them.
Split into simpler sentences: Her 1989 work "Bicycle TV" placed the viewer on a bicycle facing a video screen. As the viewer cycled, then controlled their movement through scenes of the Canadaian landscape projected before them.