Simplify the following text for a Grade 9 native English-speaking person.
Original: An early form of this was the white negro in the jazz and swing music scenes of the 1920s and 1930s ; as seen in the 1957 Norman Mailer essay , `` The White Negro : Superficial Reflections on the Hipster '' . ''
Simplified: An early form of this was the white negro in the jazz and swing music scenes of the 1920s and 1930s ; as examined in the 1957 Norman Mailer essay , `` The White Negro . ''