Input (grade 13): While Joacim was drinking with his girlfriend in a rock club he had been frequenting for over a decade, he was attacked by an unidentified person who hit him in the head with a beer glass and hastily escaped.
Output (grade 11): While Joacim was at a rock club he had been frequenting for over a decade, he was attacked by an person who hit him in the head with a beer glass and ran away.