Complex sentence: Treatment of bloody stool depends largely on the cause of bleeding, however, bleeding is commonly associated with symptoms of fatigue, dizziness, headaches, or even shortness of breath, and these associated symptoms require treatment.
Split into simpler sentences: Treatment of bloody stool depends largely on the cause of the bleeding. Bleeding is commonly associated with symptoms of fatigue, dizziness, headaches, or even shortness of breath, and these associated symptoms also require treatment.