Complex sentence: Sir Alan and The Lady Maddock divide their time between homes at Berwick-upon-Tweed, Northumberland and London SW1; they are one of the few married couples both titled in their own right.
Split into simpler sentences: Sir Alan and The Lady Maddock divide their time between homes at Berwick-upon-Tweed, Northumberland and London. He and his wife are one of the few married couples both holding titles in their own right.