Complex sentence: This is caused by a nearby star, Hydrus Beta, 20 light-years away, going supernova As result 3 billion of 14 billion people of humanity on earth were wiped out.
Split into simpler sentences: This is caused by a nearby star, Hydrus Beta, 20 light-years away, going supernova. As a result, 3 billion of the 14 billion people on earth were wiped out.