他和简曾有过不正当关系。用英语怎么说？

他和简曾有过不正当关系。

He had an illicit association with Jane.

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；

例句
He started eating an apple...
他开始吃苹果。

illicit

adj. 法律不许可的，非法的，不正当的；

例句
The crime elicited an outcry against illicit drugs.
那起罪行引发了打击违禁药品的呼声。

association

n. 协会，社团，联合，联系，联想；

例句
All members of the association adhere to a strict code of practice...
协会的所有成员都遵守一套严格的行为规范。

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。

Jane

n. 简（女子名）；

例句
It was the first time Jane and I had been apart for more than a few days...
那是我第一次和简分开数日。