Complex sentence: The young man is assured by Norge that Smoke is a blackguard and criminal who deserves to die several times over and that he is now keeping him off his own land in Delta Valley, having killed Norge's guards.
Split into simpler sentences: The young man is assured by Norge that Smoke is a blackguard and criminal who deserves to die several times over. Smoke has kept him off his own land in Delta Valley for some time, and has killed off all of Norge's guards.