Original sentence: On February 5, 2003 a large blue curtain was placed to cover this work, so that it would not be visible in the background when Colin Powell and John Negroponte gave press conferences at the United Nations
Edited sentence: On February 5, 2003, in an official act of vandalism, a large blue curtain was placed to cover this work, so that it would not be visible in the background when Colin Powell and John Negroponte gave press conferences at the United Nations