Concurrent and consecutive sentences
If someone is convicted of committing more than one crime, they are usually given a sentence for each crime.
Concurrent sentences are served at the same time.
Consecutive sentences are served one after the other - eg a 6 month sentence followed by a 3 month sentence.
The judge (or magistrate) tells the person what type of sentence they get and how it must be served.
See also:
Further information on types of Prison sentences can be found on GOV.UK's website.