Complex sentence: The lineage of Maria died out in 1268, with the death of her great-grand-grandson Conradin (or Conrad III of Jerusalem), he was executed in southern Italy on the orders of Charles of Anjou, who took the Kingdom of Sicily.
Split into simpler sentences: The lineage of Maria died out in 1268, with the death of her great-grand-grandson Conradin (or Conrad III of Jerusalem). He was executed in southern Italy on the orders of Charles of Anjou, who took the Kingdom of Sicily.