Complex sentence: The Siege of Zara or Siege of Zadar (November 10-November 23,1202) was the first major action of the Fourth Crusade and the first attack against a Catholic city by Catholic crusaders.
Split into simpler sentences: The Siege of Zara (Croatian-Zadar) (November 10-November 23,1202) was the first major action of the Fourth Crusade. It was the first attack against a Catholic city by Catholic crusaders.