Complex sentence: Zimri A. Carter (1794-1870) the man for whom Carter County was named was born South Carolina, and in 1807 at the age of 13 came to Missouri with his parents.
Split into simpler sentences: Zimri A. Carter (1794-1870), the man for whom Carter County was named, was born in South Carolina. In 1807, at the age of 13, he came to Missouri with his parents.