Complex sentence: In 865 Domagoj was forced to make an unfavourable peace with the Venetian Republic, giving hostages to Venice as a guarranty for safe passage of Venetian ships in Adriatic Sea.
Split into simpler sentences: In 865 Domagoj was forced to made a unfavourable peace with the Venetian Republic. He gave hostages to Venice as guaranty for safe passages of Venetian ships in Adriatic Sea.