Complex sentence: PJ has made a statement on the subject at the start of his new book: "Harry Potter and the Deathly Hallows", a book based on himself as a boy during 1882 in a world of greyscale colours and intruiging masks.
Split into simpler sentences: PJ has made a statement on the subject in his new book: "Harry Potter and the Deathly Hallows". A book based on himself as a boy in a world of greyscale colours and intruiging masks.