Complex sentence: Its species are native to the Americas where they have been cultivated for thousands of years, but they are now also cultivated worldwide, used as spices, vegetables, and medicines, and have become a key element in many regional cuisines.
Split into simpler sentences: Its species are native to the Americas where they have been cultivated for thousands of years. In modern times, it is cultivated worldwide, and has become a key element in many regional cuisines.