Task: Text Simplification
Input (English): However , two B vitamins , niacin and riboflavin , bind with adenine to form the essential cofactors nicotinamide adenine dinucleotide ( NAD ) and flavin adenine dinucleotide ( FAD ) , respectively .
Output (English): However , two B vitamins , niacin and riboflavin , bind with adenine to form the essential cofactors NAD and FAD respectively .