Complex sentence: Although it is still debated among historians it can safely be said that Ladislaus created a some kind of personal union between the two kingdoms, however kingship over all of Croatia would not be achieved until the reign of his successor Coloman.
Split into simpler sentences: Although it is still debated among historians, it is believed that Ladislaus created a kind of personal union between the two kingdoms. However kingship over all of Croatia would not be achieved until the reign of his successor Coloman.