Complex sentence: Bruce also served as the first United States emissary to the People's Republic of China from 1973 to 1974 and as ambassador to the North Atlantic Treaty Organization from 1975 to 1976.
Split into simpler sentences: Bruce also served as the first United States emissary to the People's Republic of China from 1973 to 1974. He was the ambassador to the North Atlantic Treaty Organization from 1975 to 1976.