Original sentence: After this episode, we are left with the impression that Tom Riddle solved the mystery of the chamber of secrets fifty years ago, helping the school through his honest intentions.Hagrid states that the his pet had never hurt anyone.Harry is all too familiar with Hagrid's liking for monstrous pets, therefore he comes to the conclusion that Hagrids giant spider had killed someone though he believes Hagrid to be innocent of any malicious intention.The scene plays out and Tom tells Hagrid that he will have to turn him in because his monster or pet had killed Myrtle.There he sees Tom Riddle, a pupil at the time, discover a monster that Rubeus Hagrid, (Hogwarts game keeper and Harry's friend) was keping in a cupboard in the dungeons
Edited sentence: There he sees Tom Riddle, a pupil at the time, pin the blame for Myrtle's death on 13-year old Hagrid, who was later the school's gamekeeper and a close friend of Harry, and already devoted to keeping dangerous magical creatures as pets