Complex sentence: The Men in Black is an international espionage organization which monitors and investigates both good and evil paranormal activity on Earth such as; alien life, demons, mutants, zombies, werewolves, legendary creatures and other paranormal beings.
Split into simpler sentences: The Men in Black is an international espionage organization which monitors and investigates both good and evil paranormal activity on Earth. Their remit includes alien life, demons, mutants, zombies, werewolves, legendary creatures and other paranormal beings.