Complex sentence: Cindy believed that the social services wanted to put Holly with foster parents, and decided to run away to Spain and flee the country and Ben had helped her by accompanying her driving to the airport but on the way they accidentally ran over Anna Green.
Split into simpler sentences: Cindy believed that Social Services wanted to put Holly with foster parents and decided to flee the country and run away to Spain. Ben helped Cindy by driving with her to the airport but on the way she accidentally ran over Anna Green.