Complex sentence: Chris Crawford is a noted computer game designer and writer, responsible for a number of important games in the 1980s, for founding "The Journal of Computer Game Design", and for organizing the Computer Game Developers' Conference.
Split into simpler sentences: Chris Crawford is a noted computer game designer and writer. He created a number of important games in the 1980s, founded "The Journal of Computer Game Design", and organized the Computer Game Developers' Conference.