Simplify the following text for a Grade 6 native English-speaking person.
Original: On 1 January 2010 the new FIDE rating list was published , and at the age of he became the youngest chess player in history to be ranked world number one , breaking the record previously held by Vladimir Kramnik .
Simplified: On 1 January 2010 , the new FIDE rating list was published . He was 19 years and 32 days old when he became the youngest chess player in history to be ranked world number one .