Sentence 1: Following the 1939 invasion of Poland by Nazi Germany and the Soviet Union , Osterwa was active in the underground education but also became ill .
Sentence 2: After the invasion of Poland by Nazi - Germany and the Soviet Union in 1939 , Osterwa was active in underground education , but also became ill .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?