Complex sentence: Butler officially rejoined the band after the end of the Tyr tour ahead of the Dehumanizer album with the intention of putting something back together with Tony Iommi and Cozy Powell.
Split into simpler sentences: Butler officially rejoined the band after the end of the Tyr tour ahead of the Dehumanizer album. Geezer Butler was going to put something back together with Tony Iommi and Cozy Powell.