How are they splitting Breaking Dawn into two movies?

The Breaking Dawn novel is split into two movies because it is a very long book. The first movie, Breaking Dawn - Part 1, covers the first half of the book, and the second movie, Breaking Dawn - Part 2, covers the second half of the book. This allowed the filmmakers to give each part of the story the time and attention it deserved.

Part 1 of Breaking Dawn focuses on Bella and Edward's wedding, their honeymoon, and Bella's pregnancy. Part 2 of Breaking Dawn focuses on the birth of Bella and Edward's daughter, Renesmee, and the conflict with the Volturi, a powerful vampire coven that believes Renesmee is a threat to their existence.

By splitting Breaking Dawn into two movies, the filmmakers were able to create two visually stunning and emotionally engaging films that faithfully adapted the novel's story.