Complex sentence: He also claims that Jesus lived in the 11th century A.D.; that the Trojan war and the Crusades were the same historical event; and that Genghis Khan and the Mongols were actually Russians.
Split into simpler sentences: He also claims that Jesus lived in the 11th century A.D. and that the Trojan war and the Crusades were the same historical event. He claims that Genghis Khan and the Mongols were actually Russians.