Complex sentence: Other early companies that bought material from Funnies, Inc. include Centaur, Fox, Hillman Periodicals, and Premium Service Company/Novelty Press, for which writer-artist Joe Simon did Blue Bolt and cartoonist Basil Wolverton did Spacehawk.
Split into simpler sentences: Other early companies that bought material from Funnies, Inc. include Centaur, Fox, and Hillman Periodicals. For the Novelty Press division of the Premium Service Company, writer-artist Joe Simon created Blue Bolt and cartoonist Basil Wolverton did Spacehawk.