Complex sentence: A dying Jun-shik tells Tatsuo that "He is now Jun-shik", as Tatsuo is Japanese and considered a sworn enemy of the Americans; meaning he could be killed on the spot.
Split into simpler sentences: A dying Jun-shik tells Tatsuo that "He is now Jun-shik". Otherwise, since Tatsuo is Japanese and considered a sworn enemy of the Americans, he could be killed on the spot.