Complex sentence: Billingsley starred in the movie as young Ralphie and is now a film producer in Los Angeles and produced Iron Man, all of Vince Vaughn's films, and is currently producing Ron Howard's new motion picture.
Split into simpler sentences: Billingsley starred in the movie as young Ralphie and is now a film producer in Los Angeles. He produced Iron Man, all of Vince Vaughn's films, and is currently producing Ron Howard's new motion picture.