Complex sentence: Great Productions is a Soho, London-based film production company, specialising in documentaries and feature films, Great Productions Ltd. current project is filming the 40-part documentary series "Great West End Theatres".
Split into simpler sentences: Great Productions is a Soho, London-based film production company, specialising in documentaries and feature films. Their current project is filming the 40-part documentary series "Great West End Theatres".