Original sentence: "Sometime about 3 000 BC, people of the Sierra Madre mountains in Mexico hybridized wild grasses to produce large, nutritious kernels we know as corn.Around 3000 BC in the “Valle de Tehuacán” in the state of Puebla, Mexico, excavations have revealed the use of the basic cereal, which is a small, wild cob that native people ate
Edited sentence: "Sometime about 3000 BC, people of the Sierra Madre mountains in Mexico hybridized wild grasses to produce large, nutritious kernels we know as corn.Excavations in the “Valle de Tehuacán” in the state of Puebla, Mexico, have revealed the use around 3000 BC of the basic cereal, a small, wild cob, eaten by native people