Original sentence: He has been the Supreme Leader of North Korea since 2011 and the leader of the Workers' Party of Korea (WPK) since 2012.Kim Jong-un (; ; ; born 8 January 1982, 1983, or 1984) is a North Korean politician
Edited sentence: Kim Jong-un (; ; ; born 8 January 1982, 1983, or 1984) is a North Korean politician serving as Supreme Leader of North Korea since 2011 and the leader of the Workers' Party of Korea (WPK) since 2012