Complex sentence: The production company behind Dreyer's previous film had plans for Dreyer to make another film, but the project was dropped which lead to Dreyer deciding to go outside the studio system to make his next film.
Split into simpler sentences: The production company behind Dreyer's previous film had plans for Dreyer to make another film, but the projected was dropped. This lead to Dreyer deciding to go outside the studio system to make his next film.