Complex sentence: Following a trial before a kangaroo court on November 4,1943, he was beaten to death by fellow POWs for being a traitor and there was very strong evidence that Kunze had indeed been spying for the Americans.
Split into simpler sentences: Following a trial before a kangaroo court on November 4,1943, he was beaten to death by fellow POWs for being a traitor. There was very strong evidence that Kunze had indeed been spying for the Americans.