Simplify the following text for a Grade 6 native English-speaking person.
Original: Abigail Powers Fillmore ( March 13 , 1798 â `` March 30 , 1853 ) , wife of Millard Fillmore , was First Lady of the United States from 1850 to 1853 .
Simplified: Abigail Powers Fillmore ( March 13 , 1798 - March 30 , 1853 ) , was the wife of Millard Fillmore , the President of the United States . She acted as the First Lady of the United States from 1850 to 1853 .