Michelle is a manager that conducts surveys of British youth,in finding that might just as well apply to American youth.本句两个that，后面都是定语。
我的理解：
第一个是关系代词，无实义。第二个是指示代词，那些。
请问这样理解是否正确？

第一个是定语从句，that关系代词，做主语
第二个宾语从句，that指示代词，做主语

2楼正解。

Michelle is a manager （that conducts surveys of British youth,）←［这是manager的后置定语，］in finding （that）←「这里省略一个that，引导宾从」that ←（这是代词，指代上文逗号之前提起的那个survey，在find引导的从句中充当主语）might just as well apply to American youth.