Complex sentence: Karunaratne became the President of The Japanese Graduate Alumni Association of Sri Lanka (JAGAAS) in 2014 he was the Secretary to the same association from 2010 to 2013.
Split into simpler sentences: Karunaratne became the President of The Japanese Graduate Alumni Association of Sri Lanka (JAGAAS) in 2014. He was the Secretary to the same association from 2010 to 2013.