tā / suī / rán / nián / qīng / shí / ài / rě / shì / dàn / rú / jīn / yǐ / jīng / bài / zǐ / huí / tóu / kāi / shǐ / rèn / zhēn / gōng / zuò / le

他虽然年轻时爱惹事，但如今已经败子回头，开始认真工作了。

Although he caused trouble when he was young, he has now turned over a new leaf and started working seriously.