Complex sentence: A special one night screening took place in the United States on 20 January 2011, during which the film was simulcast to movie theatres in 46 states; with the film dubbed into English for this one-off event.
Split into simpler sentences: A special one night screening took place in the United States on 20 January 2011, during which the film was simulcast to movie theatres in 46 states. The film was dubbed into English for this one-off event.