Complex sentence: He retired from a strong position in race 1 due to a hole in the radiator by rocks thrown up by Max Biaggi's Sterilgarda Ducati machine, but came back to finish 6th in race 2.
Split into simpler sentences: He retired from a strong position in race 1 due to a hole in the radiator by rocks thrown up by Max Biaggi's Sterilgarda Ducati machine. But came back to finish 6th in race 2.