Complex sentence: The Congressional Apportionment Amendment to the United States Constitution was the first of twelve amendments proposed by the 1st Congress in 1789 to the state legislatures for ratification.
Split into simpler sentences: The Congressional Apportionment Amendment was, and remains, a proposed amendment to the United States Constitution. It was the first of twelve amendments offered by the 1st Congress in 1789 to the state legislatures for ratification.