Complex sentence: It was the first and only Queensrÿche studio album to feature guitarist Kelly Gray, who, in the early 1980s, was in a band called Myth with vocalist Geoff Tate.
Split into simpler sentences: It was the first and only Queensrÿche studio album to feature guitarist Kelly Gray. In the early 1980s, Gray was in a band called Myth with vocalist Geoff Tate.