Complex sentence: The Carnarvon Tracking Station in Western Australia was a tracking station built in 1963 for use by NASA for the Gemini program, the second step for NASA's plan to put a human on the Moon.
Split into simpler sentences: The Carnarvon Tracking Station in Western Australia was a tracking station used by NASA. It was built in 1963 for the Gemini program, the second step for NASA's plan to put a human on the Moon.