这到底是个什么句子，请高人帮忙分析一下？

relative clauses of time 关于时间的从句

When 引导的是时间状语从句, 表示在引导词的期间内进行的行为.

时间关系从句
定语从句

relative clauses of time 关于时间 (hope that helps)

What are relative clauses?
A relative clause begins with a relative pronoun (who, whom, whose, which, that) and tells something about a noun in a sentence.

She did not want to donate money to an agency that would waste funds.
He found his wedding ring, which had fallen to the bottom of the pool.
Similar adjective clauses can be written with when or where. The guidelines are the same.

Spring is the time when the robins return and the daffodils bloom.
I shopped at Bargain World, where I found lots of cleaning supplies.

When are commas needed with relative clauses?
Commas are used only if the relative clause does not restrict or identify the noun it modifies. In the first sentence above, the relative clause is restrictive because it is needed to identify which t