Determinate prison sentences - fixed length of time
A ‘determinate’ prison sentence is for a fixed length of time.
If the sentence is for 12 months or more
For prison sentences of 12 months or more the person spends the first half of the sentence in prison and the second half in the community ‘on licence’.
If they break any licence conditions - eg they commit another crime - they could go back to prison.
If the sentence is under 12 months
For prison sentences under 12 months, the person’s normally released automatically halfway through.