Original sentence: Superman, the first comic book superhero, was so popular that superheroes soon dominated the pages of comic books
Edited sentence: Although Golden Age comic books may seem kitschy and simplistic by modern standards, the label is used because it was a time of the new artform's mainstream arrival; the creation of the "superhero" archetype; an explosion of new ideas and new characters, many still popular today; and the defining of the medium's artistic vocabulary and creative conventions by its first generation of writers, artists, and editors.However, Superman, the first comic book superhero, was so popular that superheroes soon dominated the pages of comic books, which characterised the Golden Age.Some date the start to earlier events in the 1930s, such as the publication of the first comic book in the size that would subsequently define the format (1933), or the publication of the first comic book featuring entirely original stories rather than re-prints of comic strips from newspapers (1935) by the company that would become DC Comics