Complex sentence: Hester Shaw is a fictional character from Philip Reeve's "Mortal Engines Quartet" who has terrible facial scarring, due to an attack from Thaddeus Valentine when Hester was a child.
Split into simpler sentences: Hester Shaw is a fictional character from Philip Reeve's "Mortal Engines Quartet". She suffers from terrible facial scarring, due to an attack from Thaddeus Valentine when Hester was a child.