Simplify the following text for a Grade 8 native English-speaking person.
Original: Everett , a Whig , served as U.S. Representative , and U.S. Senator , the 15th Governor of Massachusetts , Minister to Great Britain , and United States Secretary of State .
Simplified: He served as U.S. Representative , and U.S. Senator , the 15th Governor of Massachusetts , Minister to Great Britain , and United States Secretary of State .