主语去掉定定就是Students will certainly learn a lot of useful skill!
定语为brave enough to take this adventure course带to对brave enough进行修饰,比较长,所以把定语后置了.
实际就是简化了定语从句：Students who are brave enough to take this adventure course will certainly learn a lot of useful skill.那么 brave enough 可以换成是enough brave吗！为什么？不能，enough作为副词修饰brave形容词，不能置于形容词之前；另外后面的to也是由于enough引导的