Complex sentence: Propylthiouracil (PTU) is a thionamide drug used to treat hyperthyroidism by decreasing the amount of thyroid hormone produced by the thyroid gland.
Split into simpler sentences: Propylthiouracil (PTU) is a thionamide drug used to treat hyperthyroidism. It is a medicine that is used to decrease the amount of thyroid hormone produced by the thyroid gland.