后面的when the Standard Oil trust was broken up是定语从句修饰nearly a century ago么？

Yet it is hard to imagine that the merger of a few oil firms today could re-create the same threats to competition that were feared nearly a century ago in the US,when the Standard Oil trust was broken up.
感觉怪，又不是hardly ... when的用法

不是hardly ... when的用法.

that后面是一个大的定语从句，when是定语从句里的时间壮语从句

when the Standard Oil trust was broken up 在……情况下，是状语从句。

你好！ when后面的句子是a century ago的并列句吧,一起作为时间状语从句--- 一个世纪前,当Standard Oil信任破裂的时候. 仅代表个人观点，不喜勿喷，谢谢。