Complex sentence: The periodical was edited and written primarily by Burgess, who took great delight in creating pseudonyms for himself: in volume 1, four of the other "authors" are in reality Burgess writing under different names.
Split into simpler sentences: The periodical was edited and written primarily by Burgess, who took great delight in creating pseudonyms for himself. For example, in volume 1, four of the other "authors" are in reality Burgess writing under different names.