Complex sentence: He says that Six lost twenty years ago ("Fall Out"), that Six won't return to the outside world because he'd have to face defeat, that Six's secret information is worthless, and that Six is nothing.
Split into simpler sentences: He says that Six lost twenty years ago ("Fall Out") and won't return to the outside world because he'd have to face defeat. Two says that Six's secret information is now worthless and that Six is nothing.