Complex sentence: The Fairchild Aircraft Ltd. of Longueuil, Quebec, Canada was an aircraft manufacturer during the period of 1920 to 1950, which served as a subsidiary of the Fairchild company of the United States.
Split into simpler sentences: The Fairchild Aircraft Ltd. of Longueuil, Quebec, Canada was an aircraft manufacturer in the period 1920-1950. It served as a subsidiary of the Fairchild company of the United States.