Complex sentence: The most important difference between the movie and the book is that the book was about how Charles Ryder finds his way to religion through love whereas the movie is a twisted tale of betrayal, perversion, and the degeneracy of the British upper classes.
Split into simpler sentences: The most important differences between the movie and the book is that the book was about how Charles Ryder finds his way to religion, through love. The movie is a twisted tale of betrayal, perversion, and the degeneracy of the British upper classes.