The convict was pardoned after serving five years of his sentence.

罪犯服刑5年才获赦免。

《新英汉大辞典》

After five years' imprisonment, the convict was freed.

那个囚犯经过五年的监禁之后被释放了。

youdao

During his youth he had been employed in the convict establishments of the South.

在他青年时代，他在南方的监狱里服务过。

youdao

The convict feeds them, gives them water, takes care of them.

BBC: India rapist ordered to 'look after cows'

He promised to help the Venetian Navy, at the Arsenale, regain its primacy, by using physics to improve the placement of oars on the convict-rowed galleys.

NEWYORKER: Moon Man

Most of them behaved with appalling callousness to their charges, especially in the cattle trucks used for rail transports and in the convict ships of the Far East.

ECONOMIST: Soviet Russia