wèi le / huán qīng / zhài wù / tā / tǐng ér zǒu xiǎn / cān yù / le / fēi fǎ / huó dòng

为了还清债务，他铤而走险，参与了非法活动。

To pay off his debts, he took the risk out of desperation and got involved in illegal activities.