Complex sentence: Most South Africans in the United States are currently settled in San Diego, CA, at around 20,000 people, the majority of these being English speaking White South Africans, with a moderate proportion of these being South African Jews.
Split into simpler sentences: Most South Africans in the United States are currently settled in San Diego, CA, at around 20,000 people. The majority of these being English speaking White South Africans, with a moderate proportion of these being South African Jews.