Original sentence: On November 1, 1950 Puerto Rican nationalists Griselio Torresola and Oscar Collazo, fighting for the independence of Puerto Rico from the United States, attempted to assassinate President Truman in Blair House
Edited sentence: On November 1, 1950 Puerto Rican nationalists Griselio Torresola and Oscar Collazo, fighting for the independence of Puerto Rico (colony of the United States at that time), attempted to assassinate President Truman in Blair House