Andre Gunder Frank was a smart man who thought a lot about how the world works. He was really interested in figuring out why some countries are rich and other countries are poor. He thought that a lot of it had to do with history and how things happened a long time ago.
Think of it like this: imagine you and your friend both have a toy. Your friend's toy was given to them by their parents, who had a lot of money and could buy nice things. Your toy, on the other hand, was passed down from your older sibling, who didn't have a lot of money so they couldn't afford to buy new toys. Because of this, your friend's toy might be nicer than yours, even though you both like your toys the same amount.
Andre Gunder Frank thought that countries were kind of like you and your friend. Some countries had a lot of advantages a long time ago, like more resources or a better location, and that helped them become richer over time. Other countries didn't have those advantages, which made it harder for them to become rich.
But Andre Gunder Frank also believed that there was a way for poorer countries to become richer. He thought that if they could work together and share resources, they could help each other out and become stronger. It's kind of like if you and your friend both shared your toys with each other - maybe you could both have more fun that way!