In the Rock Hudson/ Jennifer Jones version, Ms. Jones chews the hell out if the hospital scenes, dragging out what could have been a minute's worth of footage when played by a more sophisticated, subtler actress (Greta Garbo of the same era, say) into what seemed an interminable length of over-emoting by an unconvincing actress.
As for the rest of the film, the producers must must've spent the bulk of their limited budget on the pretty, hi-profile actors, because the scenes have the depth of reality of a low-budget stage play.
Re-reading the Hemingway original would be a better way to spend an afternoon.