Okay, so imagine you're playing with some building blocks. You can use these blocks to make a tower, or a house, or even a bridge. Jean Monnet was kind of like a builder, but of countries instead of blocks.
He wanted to build a stronger Europe after World War II. So he helped create the European Coal and Steel Community. This was like a club where different countries in Europe agreed to work together on things like making steel and coal.
Monnet believed that if countries worked together, they would be less likely to fight each other in the future. Just like how you and your friends can build bigger and better towers if you work together instead of fighting over the blocks.
So Jean Monnet used his ideas and building skills to create a more peaceful Europe, where countries work together and build towards a brighter future.