Complex sentence: Kucheng Massacre is considered one of the worst outrages against foreigners in China prior to the Boxer Movement in 1899-1901, the only comparable event in China's missonary history being the Tianjin Massacre in 1871.
Split into simpler sentences: Kucheng Massacre is considered one of the worst outrages against foreigners in China prior to the Boxer Movement in 1899-1901. The only comparable event in China's missonary history was the Tianjin Massacre in 1871.