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