Complex sentence: Lieutenant Sabourin joined the Canadian Army, serving in the Canadian Intelligence Corps and because of his training, skills, and his fluency in both the French language and the English language, he was recruited into the Special Operations Executive.
Split into simpler sentences: Lieutenant Sabourin joined the Canadian Army, serving in the Canadian Intelligence Corps. Because of his training, skills, and his fluency in both the French language and the English language, he was recruited into the Special Operations Executive.