Complex sentence: On January 23,1793, Prussia and Russia signed the Second Partition of Poland, which was ratified by the Sejm of Grodno, convened under duress in June, and also forced to rescind the Constitution.
Split into simpler sentences: On January 23,1793, Prussia and Russia signed the Second Partition of Poland. The Sejm of Grodno, convened under duress in June, ratified the partition and was also forced to rescind the Constitution.