Complex sentence: On May 10 of the same year, Fernandina became the last town platted under the Laws of the Indies in the Western hemisphere; the town was intended as a bulwark against U.S. territorial expansion.
Split into simpler sentences: On May 10 of the same year, Fernandina became the last town platted under the Laws of the Indies in the Western hemisphere. The town was intended as a bulwark against U.S. territorial expansion.