Complex sentence: ALL and Descendents continue to tour (Warped Tour 04) between Bill's and Milo's respective careers as a recording engineer, and a biochemist--however it has been some years since either ALL or the Descendents have done any touring.
Split into simpler sentences: ALL and Descendents continue to tour (Warped Tour 04) between Bill's and Milo's respective careers as a recording engineer and a biochemist. However, it has been some years since either ALL or the Descendents have done any touring.