Original: Louis XVI (23 August 1754 – 21 January 1793) ruled as King of France and of Navarre from 1774 until 1791, and then as King of the French from 1791 to 1792.
Simplified: Louis XVI (August 23, 1754 - January 21, 1793) was King of France and Kingdom of Navarre. He ruled from  1774 until 1791, and from 1791 to 1792.