Complex sentence: Frank Thomas (1914--1968) was a Golden Age American cartoonist who worked primarily for Centaur Publications, where he created The Eye, Chuck Hardy, Dr. Hypno, and Solarman (no relation to the Marvel Comics superhero of the same name).
Split into simpler sentences: Frank Thomas (1914--1968) was a Golden Age American cartoonist who worked primarily for Centaur Publications. For Centaur he created The Eye, Chuck Hardy, Dr. Hypno, and Solarman (no relation to the Marvel Comics superhero of the same name).