Complex sentence: Malificent, the film's villian and mistress of all evil, was upset at not being invited to the Aurora's christining ceremony and cursed her to die when she touched a spinning wheel's spindle on her sixteenth birthday.
Split into simpler sentences: Malificent, the film's villian and mistress of all evil, was upset at not being invited to the Aurora's christening ceremony. So, she cursed her to die when she touched a spinning wheel's spindle on her sixteenth birthday.