Complex sentence: Previously, experts recommended sending as many as three stool samples to rule out disease if initial tests are negative, however, evidence suggests repeated testing during the same episode of diarrhea is of limited value and should be discouraged.
Split into simpler sentences: Previously, experts recommended sending as many as three stool samples to rule out disease if initial tests are negative. However, evidence suggests repeat testing during the same episode of diarrhea is of limited value and should be discouraged.