Simplify the following text for a Grade 4 native English-speaking person.
Original: Barbara Pierce Bush ( born June 8 , 1925 ) is the wife of the 41st President of the United States George H. W. Bush , and served as First Lady of the United States from 1989 to 1993 .
Simplified: Barbara Bush ( born June 8 , 1925 ) is the wife of George H. W. Bush , the 41st President of the United States . She acted as the First Lady of the United States from 1989 to 1993 .