Complex sentence: After the war Reinhard found it difficult to adjust to civilian life before he rejoined the newly founded Bundeswehr in 1956, and retired in 1967 as a Hauptfeldwebel.
Split into simpler sentences: After the war Reinhard found it difficult to adjust to civilian life before he rejoined the newly founded Bundeswehr in 1956. He later joined the Bundeswehr in 1956 and retired in 1967 as a Hauptfeldwebel.