Complex sentence: The Quigrich, or saint's staff, crosier, also known as the Coygerach, was long in the possession of a family of the name of Jore and/or Dewar (from the Gaelic deoir), who were its hereditary guardians in the Middle Ages.
Split into simpler sentences: The Quigrich, or saint's staff, crosier, also known as the Coygerach. The crosier was long in the possession of a family of the name of Jore and/or Dewar, who were its hereditary guardians in the Middle Ages.