But as the number of wage earners in manufacturing rose from 2.7 million in 1880 to 4.5 million in 1900 to 8.4 million in 1920.the number of huge plants like the Baldwin Locomotive Works in Philadelphia burgeoned，as did the size of the average plant.
(倒装结构as did…)
但随着制造业中挣工资的人数从1880年的270万上升到1900年的450万到1920年的840万，像费城的包德温机车工厂这样的大型工厂的数量也大幅增加，同时普通工厂的规模也剧增。
分句1：But as the number of wage earners in manufacturing rose from 2.7
million in 1880 to 4.5 million in 1900 to 8.4 million in 1920
分句2：the number of huge plants like the Baldwin Locomotive Works in
Philadelphia burgeoned
分句3：as did the size of the average plant
分句2是整个长句子的主句
分句1是分句2的状语
分句3是2的并列句，同时它是一个省略句
1和2、3嵌套
2和3并列
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