Complex sentence: In 1946, Toronto voters approved building a'Don Valley Traffic Artery' following the same route as the "speedway" in the same plebiscite where Toronto voters approved the construction of the Yonge Subway.
Split into simpler sentences: In 1946, Toronto voters approved building a'Don Valley Traffic Artery' following the same route as the "speedway". This was the same plebiscite where Toronto voters approved the construction of the Yonge Subway.