Complex sentence: The Duke was praised for his efforts to combat poverty on the islands, but a 1991 biography by Philip Ziegler described him as contemptuous of the Bahamians and other non-white peoples of the Empire.
Split into simpler sentences: The Duke was praised at the time for his efforts to combat poverty on the islands. A 1991 biography by Philip Ziegler, however, described him as contemptuous of the Bahamians and other non-white peoples of the Empire.