Detailed Instructions: In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.
Q: The Polish Lithuanian Commonwealth formally , the Crown of the Kingdom of Poland and the Grand Duchy of Lithuania and , after 1791 , the Commonwealth of Poland was a dual state , a bi-confederation of Poland and Lithuania ruled by a common monarch , who was both King of Poland and Grand Duke of Lithuania .
A:
The Polish Lithuanian Commonwealth ( or Union , after 1791 the Commonwealth of Poland ) was a state of Poland and Lithuania ruled by a common monarch .