Complex sentence: The site was declared "Aztec Ruin National Monument" on January 24,1923, and with a boundary change it was renamed "Ruins" on July 2,1928.
Split into simpler sentences: The site was declared "Aztec Ruin National Monument" on January 24,1923. After a boundary change, "Ruin" was changed to "Ruins" on July 2,1928.