Complex sentence: The main hall contained a monumental statue of Yakushi Nyorai, the Buddha of Healing, with monumental statues of the Twelve Divine Generals (Jūni Shinshō), sculpted by Unkei with crystal eyes; an innovation at that time.
Split into simpler sentences: The main hall contained a monumental statue of Yakushi, the Buddha of Healing, with monumental statues of the Twelve Divine Generals (Jūni Shinshō). They had been sculpted by Unkei with crystal eyes; an innovation at that time.