Complex sentence: Pulmonary hypertension (PH or PHTN) is an increase of blood pressure in the pulmonary artery, pulmonary vein, or pulmonary capillaries, together known as the lung vasculature, leading to shortness of breath, dizziness, fainting, leg swelling and other symptoms.
Split into simpler sentences: Pulmonary hypertension (PH or PHTN) is an increase of blood pressure in the pulmonary artery. Symptoms include shortness of breath, dizziness, fainting, leg swelling and other symptoms.