Original: Characterized by themes and techniques drawn from popular mass culture, such as advertising, comic books and mundane cultural objects, pop art is widely interpreted as a reaction to the then-dominant ideas of abstract expressionism, as well as an expansion upon them.
Simplified: Characterized by themes and techniques drawn from popular mass culture, such as advertising and comic books, pop art is widely interpreted as either a reaction to the then-dominant ideas of abstract expressionism or an expansion upon them.