Complex sentence: Latin America is an extremely diverse region, the major ethnic groups within it include Amerindians, Whites, Mestizos, Mulattos, Blacks and Asians and this diversity is reflected in the Latin American community in the UK.
Split into simpler sentences: Latin America is an extremely diverse region, the major ethnic groups within it include Amerindians, Whites, Mestizos, Mulattos, Blacks and Asians. The diversity of Latin America as a region is certainly represented in the Latin American community in the UK.