Complex sentence: Pendel briefs Osnard the President of Panama is going to sell the Panama Canal to the Chinese, that a revolution is being planned by the "Silent Opposition", and eventually inspires a third U.S. invasion of Panama.
Split into simpler sentences: Pendel briefs Osnard that the President of Panama is going to sell the Panama Canal to the Chinese. He adds that a revolution is being planned by the "Silent Opposition", and eventually inspires a third U.S. invasion of Panama.