Many years after they went away, 1970s came back into fashion.
Many years after they went away时间状语，after they went away，they作状语从句的主语；1970s came back into fashion.主句，1970s主语，came back into fashion.谓语部分。
they代词，没有指代对象，缺乏语境，但可以猜出来，应该指服饰。
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