Complex sentence: Being a pacifist, he was totally opposed to the war and refused to fight in it, but he did not object to helping his country, and served as a medical orderly for a few months caring for the wounded soldiers.
Split into simpler sentences: Being a pacifist, he was totally opposed to the war and refused to fight in it. He did not object to helping his country however, and served as a medical orderly for a few months caring for the wounded soldiers.