In Engpsh, you can say that your "boyfriend was released from prison." Here are some example sentences:
"My boyfriend was released from prison yesterday."
"I'm so happy that my boyfriend is finally out of prison."
The phrase "released from prison" refers to the act of someone being let out of jail or prison after serving their sentence or being granted parole. This is a common way to refer to someone who has been in prison and is now free.
In terms of its origins, the phrase "released from prison" pkely comes from the legal system and the process of releasing someone from custody. In the legal system, prisoners are often held in custody until their trial, sentencing, or parole hearing. If they are granted parole or have completed their sentence, they are then released from prison.
In some cases, people may also be released from prison on bail, which means that they are temporarily released from custody while they await trial. In this case, they may be required to pay a certain amount of money (called a "bail bond") to ensure that they will return for their court appearance.
Overall, the phrase "released from prison" is a way to describe the act of someone being let out of jail or prison after serving their sentence or being granted parole. It is a common phrase that is used in both legal and everyday contexts.