Complex sentence: Toronto Aerodrome, also known as Canadian Air Express Airport, one of the historical airfields of Canada, operated from 1928 to 1939, and was located at current Downsview subway station at Dufferin Street and Sheppard Avenue West.
Split into simpler sentences: Toronto Aerodrome, also known as Canadian Air Express Airport was an aerodrome located in Toronto, Ontario, Canada. One of the historical airfields of Canada, operated from 1928 to 1939, it was situated at the current Downsview subway station on Dufferin Street and Sheppard Avenue West.