Complex sentence: Roarke's fantasies were not without peril, but the greatest danger usually came from the guests themselves; in some cases people actually got themselves killed due to their own negligence, aggression or arrogance.
Split into simpler sentences: Roarke's fantasies were not without peril, but the greatest danger usually came from the guests themselves. In some cases people were killed due to their own negligence, aggression or arrogance.