It's extremely violent, borderline-surreal in some places, excruciatingly slow in others (by design), occasionally has two or three levels of story-within-a-story. Unlike some of his other novels, it's more of an epic than a story, which is usually very hard to put on film. The closest I can think of is something like Ben-Hur or Apocalypse Now (which adapted Conrad's Heart of Darkness); both were famously plagued by production issues.