Complex sentence: They were built in 1953-59 by the Gloucester Railway Carriage and Wagon Company for the Toronto Transit Commission (TTC), with design influences from the Q38 and R stocks of the London Underground and the 6000-series cars of the Chicago'L'.
Split into simpler sentences: They were built from 1953 to 1959 by the Gloucester Railway Carriage and Wagon Company for the Toronto Transit Commission (TTC). The design was influenced by the Q38 and R stocks of the London Underground, and the 6000-series cars of the Chicago'L'.