Simplify the following text for a Grade 14 native English-speaking person.
Original: Pythagoreanism is a term used for the esoteric and metaphysical beliefs held by Pythagoras and his followers , the Pythagoreans , who were considerably influenced by mathematics .
Simplified: Pythagoreanism is a term used for the esoteric and metaphysical beliefs held by Pythagoras and his followers , the Pythagoreans , who were much influenced by mathematics .