original: Since independence, Botswana has had one of the fastest growth rates in per capita income in the world.
simplifications: Botswana has had one of the fastest growing income rates in the world. After independence, Botswana had one of the fastest people income growth in the world. Since independence, people in Botswana have some of the fastest rates of wealth building per person. Botswana grew fast after earning its independence. Since becoming independent, Botswana has had one of the world's fastest growing per capita incomes. Since getting it's independence, Botswana has had one of the fastest growth rates of individual income in the world. Botswana has one of the quickest growth rates in household income in the world after gaining its independence. Since gaining freedom, Botswana has one of the top growth rates in the world. Botswana has the fastest growth in per capita income since its independence. Since independence, Botswana also has one of the fastest per capita income growth rates in the world.