Okay, let me explain it to you like you are five!
So, the Soviet Union was a big country a long time ago. In this country, there were many people who spoke different languages and had different cultures. Among these people were some who were Polish. Polish people are those who come from a country called Poland.
Now, even though the Soviet Union was big, the government of the Soviet Union did not want people to have too much freedom. So, they didn't let the Polish people in the country practice their own culture and speak their own language freely. They wanted everyone to speak Russian and follow the rules of the Soviet Union.
It was difficult for Polish people to live in this country. They were often treated unfairly and had limited opportunities. But, even though the Soviet government tried to suppress the Polish culture, the Polish people still tried to keep their culture and traditions alive. They tried to make sure that their language and customs were passed down to their children.
Overall, it was a tough time for Polish people living in the Soviet Union, but they tried their best to hang on to their own culture and be proud of who they were.