Complex sentence: In some works, such as fairy tales, magic items either endow the main characters with magical powers or have magical powers themselves, and are often used as plot devices or MacGuffins to drive the plot of a story.
Split into simpler sentences: In some works, such as fairy tales, magic items either endow the main characters with magical powers or have magical powers themselves. They are often used as plot devices or MacGuffins to drive the plot of a story.