It's not known when Mars was found and by whom Mars has been known for a very long time, and one of the planets that can be seen from the Earth without a telescope.

在很长一段时间里，没人知道火星是什么时候被发现的，谁发现的，也不知道有一种行星可以不用望远镜就能从地球上看到。

youdao

Who is forgotten by whom?

谁被谁遗忘？

youdao

He married a wife by whom he had two daughters.

他娶了妻子并跟她生了两个女儿。

《新英汉大辞典》

In addition to writings, the new book contains art work done by death row inmates, many of whom Will regards as true artists.

VOA: standard.2009.10.21

By whom--who made the decision? When did they make the decision?

是谁选择的？何时选择的？

耶鲁公开课 - 新约课程节选

They must be recognized by the people among whom they lived, by the communities in which they live.

他们必须被他们周围的人认可,被他们所生存的集体所认可

耶鲁公开课 - 古希腊历史简介课程节选

Mr Lexa probably knows more than anybody else of how much, how and by whom.

ECONOMIST: Slovakia's politics

How can capitalism be directed (and by whom) so that those benefits can be enjoyed by all?

ECONOMIST: Mapping settlements

But something vital is missing: a clear and coherent view of what is done best by whom.

ECONOMIST: Bagehot: Whatever works | The