Complex sentence: By the end of the year he was drawing for DC exclusively, working on such characters as the medieval adventurer Viking Prince, the superhero Hawkman, and features starring Sgt. Rock and The Haunted Tank in the war comic "G.I. Combat".
Split into simpler sentences: By the end of the year he was drawing for DC exclusively. In the coming years, he would work on such characters as the medieval adventurer Viking Prince, the superhero Hawkman, and features starring Sgt. Rock and The Haunted Tank in the war comic "G.I. Combat".