A Book is not a movie. Neither is a life story, nor an article.
Not only are there many differences in the way they are written, differences between visual and auditory narration and a difference in length, But the two media are based almost incompatible traditions; The narrative tradition vs the dramatic - History vs Story.
In order to maintain the spirit of the original source, whether that book is a novel, a short story or an article, - Editing is not enough.
Successful movies work because they are designed around a story concept.
This report breaks down your source material and offers viable concrete solutions to how the original story can work as a dramatic concept. The Report in 10 pages long and lays out:
New dramatic focus
Themes, story, and subplot
New story structure, broken down into 3 acts