Complex sentence: Grützner is credited with introducing a colorimetric method for determining the quantity of pepsin in a solution, and among his numerous written articles was an 1879 physiological study on voice and speech titled "Physiologie der Stimme und Sprache".
Split into simpler sentences: Grützner is credited with introducing a colorimetric method for determining the quantity of pepsin in a solution. Among his numerous written articles was an 1879 physiological study on voice and speech titled "Physiologie der Stimme und Sprache".