Complex sentence: Parkhurst enjoyed notoriety as one of the toughest jails in the British Isles and many notable criminals, including the Richardson brothers, the Yorkshire Ripper Peter Sutcliffe, Kenny Carter, Moors Murderer Ian Brady, and the Kray twins, were incarcerated there.
Split into simpler sentences: Parkhurst enjoyed notoriety as one of the toughest jails in the British Isles. Many notable criminals, including the Richardson brothers, the Yorkshire Ripper Peter Sutcliffe, Kenny Carter, Moors Murderer Ian Brady, and the Kray twins, were incarcerated there.