Original: He also forms rivalries with characters Draco Malfoy, a classmate from an elitist wizarding family, and the cold, condescending Potions master, Severus Snape, Draco's mentor and the head of Slytherin House.
Simplified: He also forms rivalries with characters Draco Malfoy, a classmate from an elitist wizard family, and the Potions teacher and head of Slytherin House, Severus Snape.