Complex sentence: The film was directed by Kathryn Bigelow and the screenplay was written by Mark Boal, a freelance writer who was embedded as a journalist in 2004 with a United States Army EOD team in Iraq.
Split into simpler sentences: The film was directed by Kathryn Bigelow and the screenplay was written by Mark Boal. A freelance writer, he was embedded as a journalist in 2004 with a United States Army EOD team in Iraq.