Complex sentence: Bumetanide was an undisclosed active ingredient in the over the counter weight loss supplement StarCaps, which was removed from the market after its presence was discovered by the United States Food and Drug Administration.
Split into simpler sentences: Bumetanide was an undisclosed active ingredient in the over the counter weight loss supplement StarCaps. StarCaps was pulled off the market after the presence of the undisclosed ingredient was discovered by the Food and Drug Administration.