Simplify the following text for a Grade 7 native English-speaking person.
Original: Cintas ' properties were claimed by the Castro government after the Cuban Revolution in 1959 , but Cintas , who died in 1957 , willed the Gettysburg Address to the American people , provided it would be kept at the White House , where it was transferred in 1959 .
Simplified: The Castro government claimed Cintas ' properties after it became powerful in 1959 . But Cintas , who died in 1957 , had willed the Gettysburg Address to the American people , if it would be kept at the White House .