Complex sentence: Due to this vagueness, all of the delta islands, including Harsens and Dickinson, were claimed by the British, and some from the United States who did not want to give up their English citizenship following the war made their residences there.
Split into simpler sentences: Due to this vagueness, all of the delta islands, including Harsens and Dickinson, were claimed by the British. Some persons located in the new United States who did not want to give up their English citizenship following the war moved to make their residences there.