Complex sentence: Noble Consort Yi, aged 27, was elevated to the title Empress Dowager Cixi, popularly known as the West Empress Dowager (西太后) because she lived inside the Western Chuxiu Palace.
Split into simpler sentences: Noble Consort Yi, aged 27, was also promoted to the status of empress dowager under the title "Empress Dowager Cixi". She was popularly known as the "West Empress Dowager" (西太后) because she lived inside the western Chuxiu Palace.