Complex sentence: In 1994, Noah wanted to find a way to involve the audience of readers more, and so he created the "Book of Endings" which allows the audience to have a direct impact on how the story turns out.
Split into simpler sentences: In 1994, Noah wanted to find a way to involve the audience of readers more. He created, the "Book of Endings" which allows the audience to have a voice in how the story turns out.