Simplify the following text for a Grade 16 native English-speaking person.
Original: He has held the titles of General Secretary of the Communist Party of China since 2002 , President of the People 's Republic of China since 2003 , and Chairman of the Central Military Commission since 2004 , succeeding Jiang Zemin as the top leader of fourth generation leadership of the Communist Party of China .
Simplified: He has held the titles of General Secretary of the Communist Party of China since 2002 , President of the People 's Republic of China since 2003 , and Chairman of the Central Military Commission since 2004 , succeeding Jiang Zemin as the top leader of of the People 's Republic of China .