Moreover, it is unclear how groups should be classified that are hunter-gatherers in their procurement strategies but that make use of pastoralism and cultivation in their consumption patterns---subsisting.
请问老师that are hunter-gatherers怎么样理解？ 我的理解是 it是形式主语，how groups should be classified是名词性从句充当真的的主语，that are hunter-gatherers和that make use of pastoralism and cultivation是状语从句修饰unclear（张道真的看法）,或者剖析为补足语，补充unclear的不完整语义（夸克的看法）
但，that are hunter-gatherers和that make use of pastoralism and cultivation明显不是完整的从句，请问老师，这里面哪儿剖析的不对呢？谢谢！
Moreover, it is unclear how groups should be classified that are hunter-gatherers in their procurement strategies but that make use of pastoralism and cultivation in their consumption patterns——subsisting.
【剖析】句子总体是一个“主系表”结构。
1.it（形式主语） is （系动词）unclear （表语）how groups should be classified （真的主语）
2.that are hunter-gatherers in their procurement strategies but that make use of pastoralism and cultivation in their consumption patterns （两个转折意义的定语从句，修饰groups）
3. 此现象是“词汇分隔或成分分隔”。因定语过长，为维持句子匀称，将两个定语从句后移，与先行词离别开来。分隔的成分是 should be classified。分隔种类是：定语从句与先行词被分隔。又如：
He laughs bestwholaughs last.
哪个笑到最后，哪个笑得最好
All are not friendsthatspeak us fair.
说大家好话的未必都是朋友。
What have you donethatupset her?
你做了哪些让她不开心的事?
The days are gonewhenwe Chinese were bullied by the invaders.
大家中国人被侵略者欺凌的日子一去不复返了。
The village has developed a lotwherewe learned farming two years ago.
这个村庄进步非常快，两年前大家在那里学习种植。
