Complex sentence: The office of the President of the United States in Congress Assembled was, despite the name, not an executive post; it bears a closer resemblance to the modern Speaker of the United States House of Representatives or Vice President of the United States.
Split into simpler sentences: The office of the President of the United States in Congress Assembled was, despite the name, not an executive post. It bears a closer resemblance to the modern Speaker of the United States House of Representatives or Vice President of the United States.