Complex sentence: Fraction started creating comics with the smaller publishers, like AiT/Planet Lar and IDW Publishing, before getting a hit with "The Five Fists of Science", widespread critical acclaim with Casanova and moving on to work on a number of Marvel series.
Split into simpler sentences: Fraction started creating comics with the smaller publishers, like AiT/Planet Lar and IDW Publishing. He scored a hit with "The Five Fists of Science", achieved widespread critical acclaim with Casanova and proceeded to work on a number of Marvel series.