Complex sentence: On 2 April 2011, a test screening of the film was held in Chicago, with director David Yates, producers David Heyman and David Barron and editor Mark Day in attendance.
Split into simpler sentences: On 2 April 2011 a test screening of the film was held in Chicago. Director David Yates, producers David Heyman and David Barron and the film's editor Mark Day were in attendance.