Complex sentence: During his time in space, one of the Monolith's main weapons, the Staff of Horus, was acquired by a young woman called Akasha, who was able to use that power to become a female version of the Living Pharaoh.
Split into simpler sentences: During his time in space, one of the Monolith's main weapons, the Staff of Horus, was acquired by a young woman called Akasha. She was able to use that power to become a female version of the Living Pharaoh.