Complex sentence: When a skier enters a closed or dangerous area in powder snow they leave tracks that another less experienced skier may see, assume the route is safe, and decide to follow, while not understanding the danger that lies ahead.
Split into simpler sentences: When a skier enters a closed or dangerous area in powder snow they leave sucker tracks. Another less experienced skier may see the tracks, assume the route is safe, and decide to follow, while not understanding the danger that lies ahead.