Complex sentence: He notes this in his verse, claiming that he stemmed from a land of cliffs and crags, and that Dukagjini came from Duka-Gjini, Duke Gjini (Jean).
Split into simpler sentences: He notes this in his verse, claiming that he stemmed from a land of cliffs and crags. He supports his own theory that Dukagjini name came from Duka-Gjini, Duke Gjini (Jean).