Complex sentence: The earliest example of maize comes from Guilá Naquitz, a cave in Oaxaca, that dates to c.4000 BC. It should be noted, however, that earlier maize samples have been documented at the Los Ladrones cave site in Panama, ca.
Split into simpler sentences: The earliest example of maize dates to c.4000 BC and comes from Guilá Naquitz, a cave in Oaxaca. However, earlier maize samples have been documented at the Los Ladrones cave site in Panama, ca.