Simplify the following text for a Grade 8 native English-speaking person.
Original: In February 2006 , Ban declared his candidacy to replace Kofi Annan as UN Secretary-General at the end of 2006 , becoming the first South Korean to run for the office .
Simplified: In February 2006 , Ban announced his candidacy to replace Kofi Annan as UN Secretary-General at the end of 2006 . He was the first South Korean to run for Secretary-General .