Complex sentence: Alternative rock band Kings of Leon's "Only By The Night" had the longest run among the releases that have reached peak position in 2008, spending 13 non-consecutive weeks beginning with the chart dated September 29 and continuing into the 2009 chart year.
Split into simpler sentences: Alternative rock band Kings of Leon's "Only By The Night" had the longest run among the releases that have reached peak position in 2008. It spent 13 non-consecutive weeks atop the chart, beginning with the week of September 29 and continuing into the 2009 chart year.