Complex sentence: Van Der Beek is also the co-creator and star of "What Would Diplo Do?", in which he portrays producer and DJ Diplo, and made a cameo in the film "Downsizing" (2017), starring Matt Damon.
Split into simpler sentences: Van Der Beek is also the co-creator and star of "What Would Diplo Do?", in which he portrays producer and DJ Diplo. He made a cameo in the film "Downsizing" (2017), guest starring Matt Damon.