Jīnglì le zhè chǎng biàngù, tā biàn de gèngjiā chéngshú le.
After going through this mishap, he became much more mature.
Tips
usage
变故 specifically implies an unexpected negative change, often a family crisis, accident, or sudden disruption. It is more formal and literary than 意外 (yìwài, accident) or 事故 (shìgù, incident).
