That is incredible difficult and basically boils down to resocialising people in another culture.

In the case of refugees we are facing the additional problem, that some originate from areas that are long time disfunctional, resulting in humans that never before have been socialized in a working society.

I believe that an important factor is to mix newcomers and locals, unfortunately that goes against the desire of both the government and the immigrants. Both want to centralize for efficiency resons.