Complex sentence: The Great Smoky Mountains National Park is a major tourist attraction in the region; over 9 million tourists and 11 million non-recreational visitors traveling to the park were recorded in 2003, double that of any other national park.
Split into simpler sentences: The Great Smoky Mountains National Park is a major tourist attraction in the region. Over 9 million tourists and 11 million non-recreational visitors traveled to the park in 2003, twice as many as visited any other national park.