Simplify the following text for a Grade 5 native English-speaking person.
Original: Two Horcruxes have already been destroyed : Tom Riddle 's diary , which Harry stabbed with a basilisk fang in his second year , and Voldemort 's grandfather 's ring , which Dumbledore destroyed during the summer .
Simplified: A couple of them have been destroyed . In Harry 's second year , he stabbed Riddle 's diary with a fang , destroying one .