Original sentence: The documentary includes never-before-seen behind-the-scenes footage of Bruce Lee's life, as well as parts of the original footage of his incomplete film Game of Death, which had been left out of the film
Edited sentence: The documentary includes never-before-seen behind-the-scenes footage of Bruce Lee's life, as well as parts of the original footage of his incomplete film The Game of Death (An article on this subject in simple English is also available), which had been left out of the film