they conflated things that happened to 2 people into 1 and created a couple of love stories to make the motivations easier to understand for anyone watching the movie with zero knowledge of the actual history. it is really tough to condense stuff for a movie or any medium besides books, I am doing something similar at the moment and I have altered the motivations of the main antagonist a second time because even though they were better before, the underlying story is too convoluted to present - there are other constraints than accuracy when you are making a product that people will consume in specific manner, in 1,5 to 2 hours etc

I used to hate what Hollywood did to real stories, but as I get more and more into the work of storytelling I understand the need to simplify and condense in order to make the story more compelling... if you want history read books