Complex sentence: Liberal Prime Minister William Lyon Mackenzie King held Marler in high regard and appointed him Canada's first enovy to Japan and given the formal title of Envoy Extraordinary and Minister Plenipotentiary of Canada to the Empire of Japan in 1929.
Split into simpler sentences: Liberal Prime Minister William Lyon Mackenzie King held Marler in high regard and appointed him Canada's first envoy to Japan. He was given the formal title of Envoy Extraordinary and Minister Plenipotentiary of Canada to the Empire of Japan in 1929.