Complex sentence: After leaving the Air Force, Ng was appointed as the Director of the Security and Intelligence Division on 1 September 2010 and left this position on 1 May 2014 to serve as the Permanent Secretary (Defence Development) in the Ministry of Defence.
Split into simpler sentences: After leaving the Air Force, Ng was appointed as the Director of the Security and Intelligence Division on 1 September 2010. He left this position on 1 May 2014 to serve as the Permanent Secretary (Defence Development) in the Ministry of Defence.