Complex sentence: Clunes was once closed off to the public for "The Mole" in 2001 for the mission to direct one of the contestants to pick up another contestant in a blacked out car.
Split into simpler sentences: Clunes was once closed off to the public for the TV show "The Mole" in 2001. The mission in that episode was to direct one of the contestants to pick up another contestant in a blacked out car.