Complex sentence: A fragment of Ceiphied's will is lodged within Luna, and she is known as the "Ceiphied Knight", which is mentioned in "Slayers TRY" when Lina and her group are at the Fire Dragon Temple for the first time.
Split into simpler sentences: A fragment of Ceiphied's will is lodged within Luna, and thus she is known as the "Ceiphied Knight". This is mentioned in "Slayers TRY" while Lina and her group are at the Fire Dragon Temple for the first time.