Input (grade 13): The Albigensian Crusade or Cathar Crusade (1209 - 1229) was a 20-year military campaign initiated by the Catholic Church to eliminate the Cathar heresy in Languedoc.
Output (grade 8): The Albigensian Crusade or Cathar Crusade (1209 - 1229) was a 20-year military campaign.