Simplify the following text for a Grade 7 native English-speaking person.
Original: On March 6 , 1812 , Lehigh County was formed from the western half of Northampton County , and Northampton Town was selected as the county seat .
Simplified: On March 6 1812 , Lehigh County was made from the west part of Northampton County , and Northampton was made the county seat .