Complex sentence: Natural disasters, such as supervolcanoes and asteroids, may pose existential risks if sufficiently powerful, though human-caused events could also threaten the survival of intelligent life on Earth, like catastrophic global warming, nuclear war, or bioterrorism.
Split into simpler sentences: Natural disasters, such as supervolcanoes and asteroids, may pose existential risks if sufficiently powerful, though human-caused events could also threaten the survival of intelligent life on Earth. These events could include catastrophic global warming, nuclear war, or bioterrorism.