Simplify the following text for a Grade 4 native English-speaking person.
Original: Created by Edgar Rice Burroughs , Tarzan first appeared in the novel Tarzan of the Apes ( magazine publication 1912 , book publication 1914 ) , and then in twenty-five sequels , three authorized books by other authors , and innumerable works in other media , authorized or not .
Simplified: Edgar Rice Burroughs first wrote about Tarzan in 1912 .