And there were factories in occupations such as metalwork where individual contractors presided over what were essentially handicraft proprietorships that coexisted within a single building.
(where引导定语从句;what引导的从句作presided over的宾语)
仍然有像金属制造厂一类的工厂，在那里个体承包商管理在同一幢楼里的本质上是手工艺品所有人的工场。
分句1：And there were factories in occupations such as metalwork
分句2：where individual contractors presided over
分句3：what were essentially handicraft proprietorships
分句4：that coexisted within a single building
分句1是整个长句子的主句
分句2是分句1的定语从句
分句3是2的宾语从句
分句4是3的定语从句。
1和2嵌套
2和3嵌套
3和4嵌套
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