Original sentence: "Hung Up" was Madonna's biggest selling single ever, and one of the most successful singles of all time, reaching number one in a record-breaking 45 countries.It sold 8,698,000 units, and according to the United World Chart, is the 5th most successful song since 1999 and the forty-third most successful song in music history
Edited sentence: "Hung Up" is easily, worldwide, the most successful and highest-selling single of Madonna's career, shifting 8,698,000 units.According to the United World Chart, it is the 5th most successful song since 1999 and the forty-third most successful song in music history.After the disappointing critical and commercial reaction to her previous album, American Life, (widely considered the nadir of her career), it was ironic that Madonna should return with not only her biggest selling single ever, but also one of the most successful singles of all time, reaching number one in a record-breaking 45 countries