George Douglas Campbell is not the same person as John Douglas Sutherland Campbell, although both were (at different times) Duke of Argyll. (I've not succeeded at separating the names)
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George Douglas Campbell Argyll, Duke of is currently considered a "single author." If one or more works are by a distinct, homonymous authors, go ahead and split the author.
George Douglas Campbell Argyll, Duke of is composed of 6 names. You can examine and separate out names.