Complex sentence: He had passed on the "Führerbefehl" known as the "Commando Order" which required captured saboteurs to be shot as spies (several were), and was therefore convicted and sentenced to death in 1946.
Split into simpler sentences: He had passed on the "Führerbefehl" known as the "Commando Order" which required captured saboteurs to be shot as spies, and several were. He was therefore convicted and sentenced to death in 1946.