Complex sentence: In Southeast Asia, the Manila massacre, resulted in the deaths of 100,000 civilians in the Philippines and in the Sook Ching massacre, between 25,000 and 50,000 ethnic Chinese in Singapore were taken to beaches and massacred.
Split into simpler sentences: In Southeast Asia, the Manila massacre, resulted in the deaths of 100,000 civilians in the Philippines. In the Sook Ching massacre, between 25,000 and 50,000 ethnic Chinese in Singapore were taken to beaches and massacred.