The different uses to which societies put these materials are of interest to anthropologists who may ask，for example，why a people chooses to use clay and not copper when both items are available.
(The different uses…are of interest to anthropologists…为句子主干)
各个社会对这些材料的不同用途是人类学家所感兴趣的，例如这些人类学家或许会问，当两种东西都能够得到时，为什么一个民族会选择使用粘土而不是铜。
分句1：The different uses are of interest to anthropologists
分句2：to which societies put these materials
分句3：who may ask，for example， why a people chooses to use clay and not copper when both items are available.
1和2嵌套，2中的介词to应在put之后，2定语修饰1中的uses
3和1嵌套，3中的who引导的定语修饰1中的anthropologists
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