Complex sentence: I believe that the poetics (Aristotle) should not be regarded as a marginal subject of metaphysics, but it's heart; as I think of Metaphysics not as the peripherial of physics, but it's respiratory system.
Split into simpler sentences: I believe that the poetics (Aristotle) should not be regarded as a marginal subject of metaphysics, but it's heart. As I think of Metaphysics not as the peripherial of physics, but it's respiratory system.