Complex sentence: Lavigne's third album,' The Best Damn Thing', was released in April 2007 and debuted at number one on the US' Billboard' 200, subsequently achieving platinum status in Canada selling more than 1.7 million copies in the US and six million worldwide.
Split into simpler sentences: Lavigne's third album, "The Best Damn Thing", was released in April 2007 and debuted at number one on the US "Billboard" 200, and subsequently achieving platinum status in Canada. The album sold more than 1.7 million copies in the US and six million worldwide.