Complex sentence: Xi'an, the capital of Shaanxi province, was the Holy city of Hui in China before the revolt, but the once-flourishing Chinese Muslim communities fell 93% after the revolt in Shaanxi province.
Split into simpler sentences: Xi'an, the capital of Shaanxi province, was the Holy city of Hui in China before the revolt. But once-flourishing Chinese Muslim communities fell 93% in the revolt in Shaanxi province.