Complex sentence: On the issue dated December 8,2007 the single debuted on the US "Billboard" Hot 100 at number 99 and has peaked at number nine, becoming a Top 10 hit on the chart.
Split into simpler sentences: On the issue dated December 8,2007 the single debuted on the US "Billboard" Hot 100 at number 99. It later peaked at number nine, thus becoming a Top 10 hit on the chart.