Complex sentence: The railroad sent a special relief train and many workers, although all three mainline tracks were blocked by wreckage, by late night all injured and most bodies had been recovered, and trains started to slowly move through the crash site.
Split into simpler sentences: The railroad sent a special relief train and many workers, although all three mainline tracks were blocked by wreckage. By late night all injured and most bodies had been recovered, and trains started to slowly move through the crash site.