Complex sentence: It premiered at the 2010 Sundance Film Festival, where it won the "World Cinema Documentary Editing Award", the film was released theatrically in the US on 18 August 2010.
Split into simpler sentences: It premiered at the 2010 Sundance Film Festival, where it won the "World Cinema Documentary Editing Award". The film was released theatrically in the US on 18 August 2010.