Simplify the following text for a Grade 11 native English-speaking person.
Original: He was promoted to the position of Deputy Minister for Policy Planning and International Organizations in 1995 and then appointed National Security Advisor to the President in 1996 .
Simplified: He was promoted to the position of Deputy Minister for Policy Planning and International Organizations in 1995 . He was then appointed National Security Advisor to the President in 1996 , and assumed the office of Vice Minister in 2000 .