Complex sentence: Ball p.29 Grauntsete appeared as advocate for de London: his conduct in apearing as an advocate after his appointment to the Bench was most unusual, if not unique in the history of the common law.
Split into simpler sentences: Ball p.29 Grauntsete appeared as advocate for de London. His action in apearing as an advocate after his appointment to the Bench was most unusual, if not unique in the history of the common law.