Complex sentence: Freyja and Freyr's mother is Njörðr's sister (her name is not provided in the source material), however, there is more information about his pairing with the skiing and hunting goddess Skaði.
Split into simpler sentences: Freyja and Freyr's mother is Njörðr's sister (her name is unprovided in the source material). However, there is more information about his pairing with the skiing and hunting goddess Skaði.