Complex sentence: Sachini is the first Sri Lankan to Compete in the world Championships of performing arts in Los Angeles United States in 2016 and win 2 silver Medals and one bronze for acting categories classical/open/contemporary.
Split into simpler sentences: Sachini is the first Sri Lankan to compete in the world championships of performing arts in Los Angeles in the U.S. in 2016. She won two silver medals and one bronze for acting categories classical/open/contemporary.