Complex sentence: In 2009, the company started a record label named Dirtbag Music, led by owner partners Doug Whitsit and Mark Evans, which became an overnight success when their first band, Seasons After, launched into the top 40 with the hit "Cry Little Sister".
Split into simpler sentences: In 2009, the company started Dirtbag Music-a record label led by owner partners Doug Whitsit and Mark Evans. The label became an overnight success when their first act, Seasons After, launched into the top 40 with the hit: "Cry Little Sister".