Complex sentence: Cartoons, for technical and commercial reasons, are intended to live in an eternal present or in a timeless universe without any change, Archie for example remains the same teenager since the 1950's.
Split into simpler sentences: Cartoons, for technical and commercial reasons, are intended to live in an eternal present or in a timeless universe without any change. Archie, for example, has been the same teenager since the 1950's.