Complex sentence: In Raleigh, North Carolina, colonies of these worms were mistaken as "mutated creatures", "alien lifeforms", and many other things, nevertheless, they have been confirmed to be colonies of tubifex.
Split into simpler sentences: In Raleigh, North Carolina, colonies of these worms were mistaken as "mutated creatures", "alien lifeforms", and many other things. Nevertheless, they have been confirmed to be colonies of tubifex.