Complex sentence: Before the start of the race, several cars had to move to the rear of the field: engine changes for polesitter Greg Biffle, Ryan Newman, Ricky Craven, and 1990 winner Derrike Cope.
Split into simpler sentences: Before the start of the race, several cars dropped to the rear of the field. Engine changes sent polesitter Greg Biffle to the back, with Ryan Newman, Ricky Craven, and 1990 winner Derrike Cope.