Complex sentence: The Federalist Party, named until 1792 Pro-Administration Party, was the first American political party, from the early 1790s to 1816, the era of the First Party System, with remnants lasting into the 1820s.
Split into simpler sentences: The Federalist Party, named until 1792 Pro-Administration Party, was the first American political party. It existed from the early 1790s to 1816 (the era of the First Party System); its remnants lasted into the 1820s.