Complex sentence: After their debut, D12 took a three-year break from the studio, later regrouping to release their second album, "D12 World", in 2004, which featured the popular hit single release "My Band".
Split into simpler sentences: After their debut, D12 took a three-year break from the studio. They reunited in 2004 for their second album, "D12 World", which included the hit single "My Band".