Complex sentence: De Silva was appointed Professor of Medicine, University of Kelaniya in 1996, and was Dean of Medicine (1997-2006), and a member of the University Grants Commission (2008-2011).
Split into simpler sentences: De Silva was appointed Professor of Medicine, University of Kelaniya in 1996. He was Dean of Medicine (1997-2006) and a member of the University Grants Commission (2008-2011).