Complex sentence: To international audiences, he recently achieved fame starring as Barty Crouch, Sr. in "Harry Potter and the Goblet of Fire", he has appeared on Doctor Who, and is also known for his role in "The Vicar of Dibley" as Owen Newitt.
Split into simpler sentences: To international audiences he became known as Barty Crouch, Sr. in "Harry Potter and the Goblet of Fire". He has appeared on "Doctor Who" and is also known for his role in "The Vicar of Dibley" as Owen Newitt.