Complex sentence: It is noted that regional varieties in western areas of Germany typically use red wine as the base for the marinade, an eastern areas closer to Poland and the Czech Republic use vinegar as the base more frequently.
Split into simpler sentences: It is noted that regional varieties in western areas of Germany typically use red wine as the base for the marinade. Recipes from eastern regions of Germany closer to Poland and the Czech Republic tend to use vinegar as the base more frequently.