Complex sentence: Válková, 18, was one of the youngest contestants to placed in the Top 15 competing in swimsuit at the Miss Universe 2010 pageant held on August 23,2010 in Las Vegas, Nevada becoming Czech Republic's fourth consecutive placement.
Split into simpler sentences: Válková, 18, was one of the youngest contestants to place in the Top 15. She competed in swimsuit during the finals of the Miss Universe 2010 pageant held on August 23,2010 in Las Vegas, Nevada, becoming Czech Republic's fourth consecutive placement.