Complex sentence: The giant swallowtail is common across the United States, reaching as far north as southern New England and southern Canada, as well as through Mexico and as far south as South America, and also Jamaica and Cuba.
Split into simpler sentences: The giant swallowtail is common across the United States, reaching as far north as southern New England and southern Canada. South of the United States, it is found through Mexico and as far south as South America, and is also found in Jamaica and Cuba.