Complex sentence: Third Day worked with producer Sam Taylor, who had worked on many of Kings X's records, and the resulting album was a departure from their original rootsy, Southern Rock style to a heavier, edgier, Grunge style.
Split into simpler sentences: Third Day worked with producer Sam Taylor who had worked on many of Kings X's records. It is a departure from their original rootsy Southern Rock style to a heavier, edgier Grunge style.