Simplify the following text for a Grade 6 native English-speaking person.
Original: Appearing as small white discs , the photophores are larger and more complex at the tips of the arms and at the base of the two fins , but are absent from the underside of the caped arms .
Simplified: Appearing as small white discs , the photophores are larger and more complex at the tips of the arms and at the base of the two fins . They are absent from the underside of the caped arms .