Complex sentence: Dane Jensen (Gerard Butler) is a successful Chicago-based corporate headhunter who works at the Blackridge Recruitment agency, he is in fact a headhunter whose life revolves around closing deals in a a survival-of-the-fittest boiler room.
Split into simpler sentences: Dane Jensen (Gerard Butler) is a successful Chicago-based corporate headhunter who works at the Blackridge Recruitment agency. His life revolves around closing deals in a survival-of-the-fittest boiler room.