Complex sentence: Upon gaining four Bloodstones, Witchfire's horns grow larger and when she obtains the fifth, her horns grow incrediably larger and she gains wings as well as increased power levels.
Split into simpler sentences: Upon gaining four Bloodstones, Witchfire's horns grow larger. When she obtains the fifth Bloodstone, her horns grow incrediably larger and she gains wings as well as increased power levels.