Complex sentence: In the course of his career since 1986, he has written, designed, produced, or overseen more than 39 games that have sold over 6 million units and won over 60 industry awards, including two Adventure Game of the Year awards.
Split into simpler sentences: In the course of his career since 1986, he has written, designed, produced, or overseen more than 39 games, with over six million units sold. Collectively, they have won over 70 industry awards, including two Adventure Game of the Year awards.