Complex sentence: He is a gentle and quiet boy, who in episode eight stole Reiko Mukogawa's salary when he is asked by Hibiki to visit the teacher's lounge and retrieve his grade book.
Split into simpler sentences: He is a gentle and quiet boy, who appears is Episode 8. He stole Reiko Mukogawa's salary when he is asked by Hibiki to visit the teacher's lounge and retrieve his grade book.