Simplify the following text for a Grade 7 native English-speaking person.
Original: Chelsea Victoria Clinton ( born on February 27 , 1980 ) is the only daughter of Bill Clinton , former President of the United States and his wife Secretary of State Hillary Clinton .
Simplified: Chelsea Victoria Clinton ( born February 27 , 1980 ) is the only child of former U.S. President Bill Clinton and U.S. Secretary of State Hillary Rodham Clinton .