Complex sentence: Upon auscultation of the heart sounds, a systolic ejection murmur may be heard that is attributed to the pulmonic valve, due to the increased flow of blood through the pulmonic valve rather than any structural abnormality of the valve leaflets.
Split into simpler sentences: Upon auscultation of the heart sounds, there may be a "systolic ejection murmur" that is attributed to the pulmonic valve. This is due to the increased flow of blood through the pulmonic valve rather than any structural abnormality of the valve leaflets.