The stories about the long March__ __this is one example ,are well written.

The stories about the long March__ __this is one example ,are well written.
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for which

先行词是 the stories ,_of__ which this is one example , (this is one example of the stories)

所以是从属关系，of which this is one example,所以填of which The stories about the long March are well writtenof which 前面 the stories about long march 一些有关长征的故事 后面 this is one example 其中的一个例子 这个例子是属于前面stories中的一个