Simplify the following text for a Grade 12 native English-speaking person.
Original: His most important treatises include Physics , Metaphysics , Nicomachean Ethics , Politics , De Anima ( On the Soul ) and Poetics .
Simplified: Some of his important writings are Physics , Metaphysics , ( Nicomachean ) Ethics , Politics , De Anima ( On the Soul ) , and Poetics .