Complex sentence: As the left ventricle empties, its pressure falls below the pressure in the aorta, aortic blood flow quickly reverses back toward the left ventricle, catching the aortic valve pocketlike cusps and is stopped by aortic (outlet) valve closure.
Split into simpler sentences: As the left ventricle empties, its pressure falls below the pressure in the aorta. Aortic blood flow quickly reverses back toward the left ventricle, catching the pocketlike cusps of the aortic valve, and is stopped by aortic (outlet) valve closure.