这次事故（accident)给了他一个教训，从那以后他再也不会酒后驾车了。（teach someone a lesson)

这次事故（accident)给了他一个教训，从那以后他再也不会酒后驾车了。（teach someone a lesson)

This accident has taught him a lesson,from then on,he will never drive drunken.
过去完成时表示过去发生的事情对现在造成的影响。以后不再酒后驾车就是他的影响。所以用现在完成时。Drunken 可以做形容词或副词，这里用做副词，用来修饰 drive.做后置定语。
还有一些词组可以用来表示“酒后驾车”比如说，drunk-driving
drunken drive。根据短语的词性不同，灵活运用。参考资料：个人意见，仅供参考。希望对你有帮助！

this accident taught him a lesson, so from then on, he didn't dare to drink and drive again.

this accident taught him a lesson and he will never drive after drinking again.

the accident taught him a lesson，
he didnt dare to drive after drinking from then on