Complex sentence: About 10--20 kilometres from the Jajce lies the Komotin castle and town area which is older but smaller than Jajce, it is believed the town of Jajce was previously Komotin but was moved after the black death.
Split into simpler sentences: About 10--20 kilometres from the Jajce lies the Komotin castle and town area which is older but smaller than Jajce. It is believed the town of Jajce was previously Komotin but was moved after the black death.