Complex sentence: DeZuniga worked for industry leaders Marvel and DC for 18 years, drawing such prominent Marvel characters as X-Men and Spider-Man, and He later became a videogame conceptual designer, spending a decade with the U.S. and Japan divisions of Sega.
Split into simpler sentences: DeZuniga worked for industry leaders Marvel and DC for 18 years, drawing such prominent Marvel characters as the X-Men and Spider-Man. DeZuniga later became a video game conceptual designer, spending a decade with the U.S. and Japan divisions of Sega.