信じさせようと

trying to make someone believe

→ 信じる
phrase Uncommon #9,698
trying to make someone believe Used before a verb such as する to describe trying to make someone believe something.
JA: 彼にその話を信じさせようとした。
EN: I tried to make him believe that story.

彼は彼らに自分の無実を信じさせようとしたが無駄だった。

He tried in vain to convince them of his innocence.

彼にそのことを信じさせようとしても無駄だ。

It's no use trying to make him believe that.

私は彼に私の潔白を信じさせようと努めた。

I tried to convince him of my innocence.