Complex sentence: From 1939 to 1940, he was president of the Royal Society of Canada and from 1942, until his death in 1947, he was the first president of Carleton College (which was later became Carleton University).
Split into simpler sentences: From 1939 to 1940, he was president of the Royal Society of Canada. From 1942, until his death in 1947, he was the first president of Carleton College (which was later became Carleton University).