Complex sentence: Alfuzosin (INN, provided as the hydrochloride salt) is an α 1 receptor antagonist used to treat benign prostatic hyperplasia (BPH).
Split into simpler sentences: Alfuzosin (INN, provided as the hydrochloride salt) is a pharmaceutical drug of the alpha-1 blocker class. It is thus used to treat benign prostatic hyperplasia (BPH).