Complex sentence: Vergne stated that he lost the chance to achieve a strong result in the race when his car developed problems with his car's water pump and described the event as "a big mess" but felt certain that he could secure the championship.
Split into simpler sentences: Vergne stated that he lost the chance to achieve a strong result in the race when his car developed problems with its water pump. He described the event as "a big mess" but felt certain that he could secure the championship.