Complex sentence: She was an editor for DC Comics from 1995 to 2010, where she worked on superhero titles, directed the Johnny DC imprint, and edited original graphic novels for the Vertigo imprint.
Split into simpler sentences: She was an editor for DC Comics from 1995 to 2010, where she worked on a wide variety of titles. Her responsibilities at DC included editing popular superhero titles, establishing the Johnny DC imprint, and lining up original graphic novels for the mature-readers Vertigo imprint.