Simplify the following text for a Grade 10 native English-speaking person.
Original: Mike Richardson , the owner of several comic book shops in the Portland , Oregon metropolitan area , began to publish in 1986 with an anthology series called Dark Horse Presents , investing profits from his stores into Dark Horse Comics .
Simplified: Richardson is the owner of several comic book shops in the Portland , Oregon metropolitan area . In 1986 , he began to publish an anthology series called Dark Horse Presents using money from his stores .