Complex sentence: Not all of the names mentioned can be identified with certainty figures that can be clearly identified are "Uuôdan" (Wodan, Wotan, Odin) and "Frîia" (Freyja or Frigg).
Split into simpler sentences: Not all of the names mentioned can be identified with certainty. However, figures that can be clearly identified are "Uuôdan" (Wodan, Wotan, Odin) and "Frîia" (Freyja or Frigg).