Complex sentence: The Canadian government was agreeable to the proposal, and the laboratory was located in Montreal, initially in a house belonging to McGill University, before moving to permanent accommodation at the Université de Montréal in March 1943.
Split into simpler sentences: The Canadian government agreed to the proposal, and the Montreal Laboratory was established in a house belonging to McGill University. It moved to permanent accommodation at the Université de Montréal in March 1943.