Complex sentence: The Hearst prize was offered by publisher William Randolph Hearst offered a US $50,000 prize to the first aviator to fly coast to coast in the United States, in either direction, in less than 30 days from start to finish.
Split into simpler sentences: The Hearst prize was offered by publisher William Randolph Hearst. It was a US $50,000 prize to the first aviator to fly coast to coast in the United States, in either direction, in less than 30 days from start to finish.