Complex sentence: It was noted that the age of the rocks are between 275 to 300 million years old, the site was visited by Native Americans and immigrants for thousands of years and is the home of a rare fern that only grows in certain places in the country.
Split into simpler sentences: It was noted that the age of the rocks are between 275 to 300 million years old. The site was visited by Native Americans and immigrants for thousands of years and is the home of a rare fern that only grows in certain places in the country.