Complex sentence: Of these, 49 were sentenced to death, but only one soldier, Eddie Slovik, was actually executed for desertion; he is the only American soldier to be executed since the American Civil War.
Split into simpler sentences: Of these, 49 were sentenced to death, but only one soldier, Eddie Slovik, was actually executed for desertion. He remains the only American soldier to be court-martialled and executed for desertion since the American Civil War.