Complex sentence: The Twelfth Canadian Ministry was the first cabinet of Prime Minister William Lyon Mackenzie King, which governed Canada from 29 December 1921 to 28 June 1926, including the 14th Canadian Parliament and most of the 15th.
Split into simpler sentences: The Twelfth Canadian Ministry was the first cabinet of Prime Minister William Lyon Mackenzie King. It governed Canada from 29 December 1921 to 28 June 1926, including the 14th Canadian Parliament and most of the 15th.