Complex sentence: The event that marked the zenith of the style and gave it its name was the International Exposition of Modern Industrial and Decorative Arts in the summer of 1925 It was officially sponsored by the French government, and covered a site in Paris of 55 acres.
Split into simpler sentences: The event that marked the zenith of the style and gave it its name was the International Exhibition of Modern Industrial and Decorative Arts in the summer of 1925. This was officially sponsored by the French government, and covered a site in Paris of 55 acres.