Complex sentence: After an unsuccessful attempt at stopping a group of graffiti artists gets him beat up, stabbed and run over, he spends a long period of time at the hospital where he has many operations including having metal plates placed inside his head.
Split into simpler sentences: After an unsuccessful attempt at stopping a group of graffiti artists gets him beat up, stabbed and run over. He spends a long period of time at the hospital where he has many operations including having metal plates placed inside his head.