Complex sentence: A scratch race is a cycling race in which all contestants start on equal terms and finishing order is based on the final order across the finish line "scratch" at the completion of the race; there are no intermediate points or sprints.
Split into simpler sentences: A scratch race is a cycling race in which all contestants start (on equal terms). Finishing order is based on the final order across the line at the completion of the race; there are no intermediate points or sprints.