Complex sentence: He became seriously interested in film while attending Harvard after befriending Dan Schrecker, an aspiring animator, and Sean Gullette, who would go on to star in Aronofsky's first film, "Pi".
Split into simpler sentences: He became seriously interested in film while attending Harvard after befriending Dan Schrecker, an aspiring animator. He also met Sean Gullette at Harvard, who would go on to star in Aronofsky's first film, "Pi".