Original: Although not the first vetoed (China vetoed the third term of Kurt Waldheim in 1981), Boutros-Ghali was the only UN secretary-general not to be elected to a second term in office.
Simplified: Although not the first vetoed (China vetoed the third term of Kurt Waldheim in 1981), Boutros-Ghali was the first and only UN secretary-general not to be elected to a second term in office.