Complex sentence: Blepharisma are covered in tiny hairlike parts called cilia, which allow them to move through water-more slowly than vinegar eels, however, compared with Volvox, they move rather quickly.
Split into simpler sentences: Blepharisma are covered in tiny hairlike parts called cilia, which allow them to move through water. They move more slowly through water with their cilia than vinegar eels, however, compared with Volvox, they move rather quickly.