Complex sentence: When she arrived in the Salt Lake Valley, using no anesthetic, her legs were amputated below the knee but because of the imprecise amputation, her stumps never healed and were bloody for the rest of her life.
Split into simpler sentences: When she arrived in the Salt Lake Valley, her legs were amputated, using no anesthetic, below the knee. Because of the imprecise amputation, her stumps never healed and were bloody for the rest of her life.