Complex sentence: Botswana has since transformed itself into one of the fastest-growing economies in the world, now boasting a GDP (purchasing power parity) per capita of about $18,825 per year, which is one of the highest in Africa.
Split into simpler sentences: Botswana has since transformed itself into one of the fastest-growing economies in the world. Botswana boasts a GDP (purchasing power parity) per capita of about $18,825 per year, which is one of the highest in Africa.