Complex sentence: After 1281, title of Dolfin d'Alvernhe or Dauphin d'Auvergne were given to princes of Auvergne a heirs of Constantinople unlike Dauphin de Viennois, heirs of Kingdom of Jerusalem (1099-1291).
Split into simpler sentences: After 1281, the title of Dolfin d'Alvernhe or Dauphin d'Auvergne was given to princes of Auvergne, who were heirs to Constantinople. This is not to be confused with the title Dauphin de Viennois, which was given to heirs of the Kingdom of Jerusalem (1099-1291).