Ah thanks - now I know.
Here's a movie review of "Doctor Zhivago" which focused on the "love story" and noted a number of scenes and characters, important for Pasternak's philosophical vision of the fate of his generation, were omitted. ". . . the biggest disappointment of 1965 . . . There is nothing holding the effects together, not an idea, or a feeling, or a mood, or even much of a plot, and a relatively capable cast struggles helplessly with Robert Bolt's disconnected, uninspired dialogue as the film bumbles along to boredom."
(Andrew Sarris in Village Voice, December 30, 1965)
I have to say, I kinda agree. But I didn't know Bolt wrote the screenplay, he's a good writer.
(I'm off to work. Take care)