why they make breaking down in two parts? and are their premieres?

the books r to long and they want the movie to be broken in 2 pats

Well if u see how big the book is n all the details in it, you'll know why they're breakin it down to two parts, the director wants MOST of the book's details in the movie plus he's own twist but there are so many things goin on in the story that one movie will just not cut it. N I bet there will be a premieres for both juz like they did for the last 3 movies of the Saga.