Once there was a flat, damp land that smelled like wild onions. This land lay along an American river and lake. Then one day a tall, hamdsome black man came along. He looked at the river and the lake and said to himself,

"This is a good place for a trading business."

He start trading, and He built a workshop and a bakery and barns. 

Slowly, a town began to grow. City name is Chicago.

Indians said, "The first white man to settle in Chicago was a black man!"

And he was.

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Correction:  Student's sentence   Corrected sentence        Grammar explanation       Better sentence  

Once there was a flat, damp land that smelled like wild onions.

This sentence is correct.

This land lay along an American river and lake. 

This sentence is correct.