Complex sentence: It may cause no symptoms, but it is often associated with palpitations, fainting, chest pain, or congestive heart failure; however, in some people atrial fibrillation is caused by otherwise idiopathic or benign conditions.
Split into simpler sentences: It may cause no symptoms, but it is often associated with palpitations, fainting, chest pain, or congestive heart failure. However, in some people atrial fibrillation is caused by otherwise idiopathic or benign conditions.