Complex sentence: Nadia drops Alex into a water-tank to be killed by a giant Portuguese Man o' War, but he escapes using the metal-disintegrating spot cream supplied by Smithers, rupturing the tank and killing Nadia when the jellyfish hits her.
Split into simpler sentences: Nadia drops Alex into a water-tank to be killed by a giant Portuguese Man o' War. He escapes by using the metal-disintegrating spot cream supplied by Smithers, rupturing the tank and killing Nadia when the jellyfish hits her.