By Marsange, Cecil Howard; crop and retouch by Electron - crop from File:Cecil Howard - Fête de l'Arcouest 1920-30 b.jpg, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=47927363
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Charles Seignobos is currently considered a "single author." If one or more works are by a distinct, homonymous authors, go ahead and split the author.
Charles Seignobos is composed of 2 names. You can examine and separate out names.