わかってもらう

get someone to understand; have someone understand

→ 分かる
phrase Rare #22,662
get someone to understand; have someone understand わかってもらう describes having someone understand your thoughts, feelings, or situation. もらう adds the sense that you receive this understanding from them.
JA: 彼にそれをわかってもらうことができた。
EN: I was able to get him to understand that.

私が彼の商売にお返しをしていると、彼にわかってもらうために。

So he would understand that I was paying him back for his business.

実はラジューにわかってもらうためだったんだ

Actually, it was so Raju would understand.

— きっと、うまくいく (2009)

彼は学生たちに彼の考えをわかってもらうことが困難だとわかった。

He found it difficult to make the students understand his ideas.

彼にそれをわかってもらうことが出来た。

I was able to get him to understand it.

彼は会議で自分の考えをわかってもらうのに苦労した。

He had difficulty getting his ideas across in the meeting.