Simplify the following text for a Grade 11 native English-speaking person.
Original: Once again Poland dared to reform and improve itself without Russia 's permission , and once again the Empress was angered ; arguing that Poland had fallen prey to the radical Jacobinism then at high tide in France , Russian forces invaded the Commonwealth in 1792 ( EB . )
Simplified: Arguing that Poland had fallen prey to the radical Jacobinism then at high tide in France , Russian forces invaded the Commonwealth in 1792 .