Complex sentence: After his military obligations, in 1953, he joins the "Compagnie Grenier Hussenot" for seven years as a theatre actor where he is noticed for his ease in playing both drama and comedy.
Split into simpler sentences: After his military obligations, in 1953, he joined the "Compagnie Grenier Hussenot" as a theatre actor for seven years. There he was noticed for his ease in playing both drama and comedy.