Complex sentence: From 1790 to 1800, while Philadelphia was the temporary capital of the United States, it served as the executive mansion for Presidents George Washington and John Adams until the national capital moved to Washington, DC in November 1800.
Split into simpler sentences: From 1790 to 1800, while Philadelphia was the temporary capital of the United States, it served as the executive mansion for Presidents George Washington and John Adams. The national capital moved to Washington, DC in November 1800.