Complex sentence: The "Assassin's Creed" books are a series of novels set within the fictional universe of the "Assassin's Creed" video game.It is about an Assassin who becomes involved in a war between the Assassins Order and the Knights Templar.
Split into simpler sentences: The "Assassin's Creed" books are a series of novels set within the fictional universe of the "Assassin's Creed" video game. The books follow an Assassin who becomes involved in a war between the Assassins Order and the Knights Templar.