Return to Germany – how to insure?

My brother will return to Germany shortly after a six-year stay in Italy. There he had a vehicle almost all the time. He wants to take the current car (exported from D) with him again to D. Before his stay in Italy he was also seven years abroad, but without his own car. My questions: – is it easily possible to have the damage-free years experienced in Italy charged with German car insurance? – Are there insurance companies that do that? n and others not? – Which documents are required for such a credit? Greeting Florian