Complex sentence: It is based on the sixth novel of the same name by J. K. Rowling, which is the sixth instal ment of the "Harry Potter" film series, was adapted by Steve Kloves and produced by David Heyman and David Barron.
Split into simpler sentences: It is based on the novel of the same name by J. K. Rowling. The film, which is the sixth instal ment in the "Harry Potter" film series, was written by Steve Kloves and produced by David Heyman and David Barron.