Dear @Patrifa,
Welcome to the Wefugees Community and thank you for your question.
If someone gets deported, the German authorities most probably impose a re-entry ban (ban on entry and residence) for Germany and the Schengen area for a certain period (in most of the times for five years, if I am not mistaken). According to Section 11 (4) of the German Residence Act there might be a possibility to lift or at least shorten the re-entry ban. To have a chance to apply successfully, the person should have paid the costs of the deportation. People need to present their reasons for lifting/shortening of the re-entry ban to the BAMF, which will decide on this. As the procedure is quite complicated and difficult, I would strongly recommend to get support by a good lawyer (specialized in residence/migration law) in this case.
I will also link two of our experts here: Dear @mbeon-Rukundo or @mbeon-fardeen: Do you agree with my explanations and is there anything you would like to add?
However, also don't hesitate to get back to us with any further questions.
All the best,
Meike