Complex sentence: Rich was also a participant in the only recorded torture of a gentlewoman at the Tower of London, Anne Askew, who later stated that Chancellor Wriothesley and Rich had screwed the rack to torture her with their own hands.
Split into simpler sentences: Rich was also a participant in the torture of Anne Askew, the only woman to be tortured at the Tower of London. Both he and Chancellor Wriothesley screwed the rack to torture her with their own hands.