Complex sentence: William "Will" Simpson is a Northern Irish comic artist who started off in British comics, like "Warrior" and 2000 AD, and has since illustrated comic books for such industry heavyweights as DC Comics and Marvel Comics.
Split into simpler sentences: William "Will" Simpson is a Northern Irish comic artist. Simpson started off in British comics, like "Warrior" and "2000 AD", and has since illustrated comic books for such industry heavyweights as DC Comics and Marvel Comics.