Complex sentence: After Mohammad Mosaddegh being overthrown in a coup d'état in 1955 he got fired from Iranian army and sentenced to death however he had been forgiven and eventually spend 8 years in jail in Pahlavi regime (Shah).
Split into simpler sentences: After Mohammad Mosaddegh was overthrown in a coup d'état in 1955 he was fired from the Iranian army and sentenced to death. However, he was forgiven and eventually spent 8 years in jail under the Pahlavi regime (Shah).