it will be according to his sincereness , and according to how far his sins influenced the others , such as rape , killing , robbing , beating someone , oppressed someone
God is just , and even if his servant repented and God accepted his repentance , it dosn’t mean that he almighty will ignore those innocents people , they still have rights and God will not neglect it unless the sinner allready seek their forgivness in his life .
In case there is person who did sins and looking for forgiveness:
He should follow these steps:
- He should correct as much as possible what he did before especially if he harmed any human:
For example: if he is killer he should look for forgiveness from the family. If he stole something, he should return it…………etc
- He should declare that he would never do this sin again.
- He should do as much as possible good things: praying, fasting, helping poor people, giving money to charitable association………(in the past the best thing was to buy slave and to give him his freedom)
- Even if the person followed the last procedure, he will never know if Allah forgave him or not. ( he will know in the judgment day)
so , for serious crimes , it’s possible to be forgiven but not so easy as the simple sins , but he should work hard because the mercy of ALLAH larger than all human sins
peace