Complex sentence: It is estimated that near the 4% of the Chilean population is of Asian origin immigrants descendant, chiefly of the Middle East (i.e. Palestinians, Syrians, Lebanese and Middle East Armenians), are around 800,000.
Split into simpler sentences: It is estimated that near the 4% of the Chilean population is of Asian origin immigrants descendant, chiefly of the Middle East. There are a large community of Arab Chileans (i.e. Palestinians, Syrians, Lebanese and Middle East Armenians), and the total number are around 800,000.