Complex sentence: After his graduation, he served during the Korean War in the United States Navy and joined the Harvard University faculty following the completion of his military service in 1954, and would remain there full-time until his death.
Split into simpler sentences: After his graduation, he served during the Korean War in the United States Navy. Hed joined the Harvard University faculty following the completion of his military service in 1954, and would remain there full-time until his death.