Simplify the following text for a Grade 13 native English-speaking person.
Original: Furthermore , the primitive reptilian jaw joint between the articular and quadrate bones , which in modern mammals has moved into the middle ear and become part of the ear ossicles as malleus and incus , is still to be found in Morganucodon .
Simplified: Furthermore , the primitive jaw joint between the articular and quadrate bones , which in modern mammals has moved into the middle ear and become part of the ear ossicles as malleus and incus , is still to be found in Morganucodon .