Question:  John Mathieson, BSC is one of a group of film makers who emerged from the music video industry whose peers include the director of  a 2007 British romantic war drama that chronicles a crime and its consequences over the course of how many decades? 
Sentence (from "List of accolades received by Atonement (film)"): The film opened the 64th Venice International Film Festival on 29 August 2007 and competed for the Golden Lion.
Relevant evidence: No