Complex sentence: Leonard B. Cole is a comic book artist who worked during the Golden Age of Comic Books, producing work in various different genres, such as science fiction, romance, horror, adventure, mystery, sports and humor.
Split into simpler sentences: Leonard B. Cole is a comic book artist who worked during what is referred to as the Golden Age of Comic Books. Over the course of his career Cole created work in a number of genres, including science fiction, romance, horror, adventure, mystery, sports and humor.