Complex sentence: As the war ended, the children and their mothers were made outcasts by many among the general populace in formerly occupied countries, as societies grieved and resented the losses of the war, and actively rejected everything associated with Germany.
Split into simpler sentences: As the war ended, the children and their mothers were made outcasts by many among the general populace in formerly occupied countries. They grieved and resented the losses of the war, and everything that had to do with Germany.