Complex sentence: Kim Sozzi's 2008 single "Feel Your Love" was the number one single in 2009, but qualifies in the 2009 year-end chart because Billboard starts tracking weekly charts every November of the previous year.
Split into simpler sentences: Kim Sozzi's 2008 single "Feel Your Love" was the number one single in 2009. It qualified for the 2009 year-end chart because Billboard starts tracking weekly charts every November of the previous year.