Complex sentence: It has killed millions in the past year and will keep doing so if the FDA do not put a stop to this world wide danger it may soon infect the world with a deadly virus such as a zombie apocalypse does.
Split into simpler sentences: It has killed millions in the past year and will keep doing so if the FDA does not put a stop to this world wide danger. It may soon infect the world with a deadly virus such as a zombie apocalypse does.