Complex sentence: In the United States, castoreum as a food additive is considered by the Food and Drug Administration (FDA) to be generally recognized as safe, often referenced simply as a "natural flavoring" in products' lists of ingredients.
Split into simpler sentences: In the United States, castoreum is considered to be a GRAS food additive by the Food and Drug Administration. It is often referenced simply as a "natural flavoring" in products' lists of ingredients.