The part involved him testifying in favor of letting the surviving dinosaurs of the world go extinct, and that sequence was split up and featured at both the beginning and end of the film.
He was a notable presence, but hardly a key part of the plot.
J.A. Bayona’s Jurassic Park: Fallen Kingdom, the last chapter in this franchise, notably tied the newest era back to the original with the inclusion of Jeff Goldblum as fan favorite character Ian Malcolm – but he was entirely separated from the action in the movie.