Complex sentence: In the Western school of thought, alchemy was often portrayed with having the ultimate goal of creating the Philosopher's Stone, a substance that allegedly able to turn any mineral into gold as well as create an elixir that granted immortality.
Split into simpler sentences: In the Western school of thought, alchemy was often portrayed with having the ultimate goal of creating the Philosopher's Stone. A substance that allegedly able to turn any mineral into gold as well as create an elixir that granted immortality.