Complex sentence: United States Senator Daniel Webster had introduced a resolution, recorded in the Congressional Record and widely considered one of his better orations (printed in the Collected Works of Daniel Webster), advocating that the USA be the first nation to diplomatically recognize Greece.
Split into simpler sentences: United States Senator Daniel Webster had introduced a resolution, recorded in the Congressional Record that is widely considered one of his better orations (printed in the Collected Works of Daniel Webster). He advocated that the USA be the first nation to diplomatically recognize Greece.