Complex sentence: A ballad known as "Sir Hugh" describes the murder of Hugh of Lincoln, ascribing it to a "Jew's daughter", who entices Sir Hugh into her "castle", stabs him through the heart and then dumps him in the well.
Split into simpler sentences: A ballad known as "Sir Hugh" is based on the murder of Hugh of Lincoln. The "Jew's daughter" then entices Sir Hugh into her castle, stabs him through the heart and then dumps him in the well.