Okay kiddo, historia narodu polskiego means the history of the Polish people. So, a long time ago, in a place called Poland, there were people who made their home there. These people had their own way of living, their own language, and their own traditions.
As time passed, Poland became a big and important place with lots of wars and battles with other countries nearby. The Polish people had to work really hard to protect their home and their culture.
Sometimes, there were very nice and fair kings and queens who ruled the country and made it great. Other times, there were bad rulers who didn't care about the people and made things hard for them.
But no matter what happened, the Polish people always kept their spirit strong and their pride in their culture even when they weren't free to govern themselves. Finally, after many years, Poland gained its independence and became its own country again.
Today, the history of the Polish people is celebrated and remembered for all the hardships they faced and the victories they achieved. The Polish people are now proud to have a rich history and culture that they can share with the world.