Complex sentence: Key was first noticed in the stage production "Far Too Happy" with the Cambridge Footlights, which was a sell out at the Edinburgh Fringe and was nominated for a Perrier Best Newcomer Award.
Split into simpler sentences: Key was first noticed in the stage production "Far Too Happy" with the Cambridge Footlights, which was a sell out at the Edinburgh Fringe and picked up a Perrier Award "Best Newcomer" Nomination. The latter was nominated for a Perrier Best Newcomer Award.