Complex sentence: Matilda I (or Maud) (1105?--3 May 1152), "suo jure" Countess of Boulogne, was queen consort of England as the wife of King Stephen.
Split into simpler sentences: Matilda I (or Maud) (1105?--3 May 1152) was "suo jure" Countess of Boulogne. She was also queen consort of England as the wife of King Stephen.