Complex sentence: There were 160 laps done on a.625 mile dirt track (100 miles) with the average speed being 71.034 miles per hour and the pole position speed being 78.37 miles per hour.
Split into simpler sentences: There were 160 laps done on a.625 mile dirt track with the total distance of the race being 100 miles. The average speed being 71.034 miles per hour and the pole position speed was considered to be 78.37 miles per hour.