Complex sentence: They can orally consume 100 ml of concentrated syrup containing either 15 grams of pentobarbital or 15 grams of secobarbital; or they can choose to have 2 grams of thiopental or 1 gram of propofol administered intravenously by a doctor, followed by a muscle relaxant.
Split into simpler sentences: They can orally consume 100 ml of concentrated syrup containing either 15 grams of pentobarbital or 15 grams of secobarbital. Or they can choose to have 2 grams of thiopental or 1 gram of propofol administered intravenously by a doctor, followed by a muscle relaxant.