Complex sentence: Radiohead singer Thom Yorke and guitarist Jonny Greenwood, billed simply as "Special Guests", performed on the Park Stage on the Friday, introduced by Glastonbury founder Michael Eavis, who called them "two superstars" and "the biggest surprise of the weekend".
Split into simpler sentences: Radiohead singer Thom Yorke and guitarist Jonny Greenwood performed on the Park Stage on the Friday of the festival. The were introduced by Glastonbury founder Michael Eavis who called them "two superstars" and "the biggest surprise of the weekend".