Complex sentence: Hearing her having trouble with exams, he decides to help her and be a'superhero', he goes to the University, hacks into the University's servers to download the exam questions, but he is caught by a security guard and arrested.
Split into simpler sentences: Hearing her having trouble with exams, he decided to help her and be a'superhero'. He went to the University, hacked into its servers to download the exam questions, but he was caught by a security guard and arrested.