Complex sentence: He barely mentioned Oz in the text, and no Oz characters other than his own and a brief mention of the Wizard, his publisher, Whitman, was sued by Reilly and Lee after publishing the first part in its Big Little Books series in 1936.
Split into simpler sentences: He barely mentioned Oz in the text, and no Oz characters were used except for his own and a brief mention of the Wizard. His publisher, Whitman, was sued by Reilly and Lee after publishing the first part in its Big Little Books series in 1936.