Complex sentence: Hermione later attempts to pose as Millicent in order to covertly collect information from Draco Malfoy in the Slytherin common room by preparing some Polyjuice Potion, adding a strand of hair she found on Bulstrode's robes after the Dueling Club scuffle.
Split into simpler sentences: Hermione later attempts to pose as Millicent in order to covertly collect information from Draco Malfoy in the Slytherin common room. She prepares some Polyjuice Potion, adding a strand of hair she found on Bulstrode's robes after the Dueling Club scuffle.