Input (grade 12): Tristan was allowed to leave with the promise never to come back, but he later returned with the intention of marrying Isolde to his uncle, King Marke.
Output (grade 7): Tristan had been allowed to go back to Cornwall. However, it seemed now he had told his uncle, King Marke, all about the beautiful Isolde and had come to get her so that his uncle could marry her.