Complex sentence: After the colonization of America, maize was introduced to the English-speaking world, and originally known as Indian corn, a term which was then increasingly often shortened to corn in America, but not in the UK, where the original meanings were retained.
Split into simpler sentences: After the colonization of America, maize was introduced to the English-speaking world, and was originally known as Indian corn. The term was then increasingly often shortened to corn in America, but not in the UK, where the original meanings were retained.