Complex sentence: Mach and Dr. Crumb looked toward the silo opening and saw a few red hairs clinging to the edge of the heavy steel silo door which was only 17 inches wide and 25 inches high.
Split into simpler sentences: Mach and Dr. Crumb looked toward the silo opening and saw a few red hairs clinging to the edge of the heavy steel silo door. The silo door was only 17 inches wide and 25 inches high.