Complex sentence: Stephanie Siriwardhana (born 5 February 1988) is a Sri Lankan model and a beauty pageant titleholder who was crowned Miss Sri Lanka 2011 and represented her country at the 2011 Miss Universe pageant.
Split into simpler sentences: Stephanie Siriwardhana (born 5 February 1988) is a Sri Lankan model. She was crowned Miss Sri Lanka 2011 and competed at the 2011 Miss Universe pageant.