Complex sentence: The Linear D6 version is a significant expansion of the original material, including a more fully developed setting, a monster manual and game mechanics, all of which were previously provided by the core D20 System rule books.
Split into simpler sentences: The Linear D6 version is a significant expansion of the original material. Including a more fully developed setting, a monster manual and game mechanics, all of which were previously provided by the core D20 System rule books.