Complex sentence: He represented Kerala University in the South Zone Inter-University Youth Festival and was declared the winner three years in a row--2009,2010 and 2011, and participated in the National Inter University Youth Festival.
Split into simpler sentences: He represented Kerala University in the South Zone Inter-University Youth Festival and was declared the winner three years in a row--2009,2010 and 2011. He has participated in the National Inter University Youth Festival.