Complex sentence: Aristotle also believed that there were four sections of the soul: the calculative part, the scientific part on the rational side used for making decisions, the desiderative part, and the vegetative part on the irrational side responsible for identifying our needs.
Split into simpler sentences: Aristotle also believed that there were four sections of the soul. The four sections are calculative part, the scientific part on the rational side used for making decisions and the desiderative part and the vegetative part on the irrational side responsible for identifying our needs.