Original: Subsequent singles, "Sk8er Boi" and "I'm With You" reached the top ten in the U.S. Thanks to the success of her first three singles, Lavigne was the second artist in history to have three # 1 songs from a debut album on the Billboard Mainstream Top 40.
Simplified: Thanks to the success of her first three singles, Complicated, Sk8er Boi and I'm With You, Lavigne, then a teenager, became the second artist in history to have three number 1 songs from a debut album on the Billboard Mainstream Top 40.