Complex sentence: Longview is located approximately 125 miles east of Dallas in northeast Texas, and had a population 5,700 in 1919, of which 1,790, or thirty-one percent, was African American.
Split into simpler sentences: Longview is located approximately 125 miles east of Dallas in northeast Texas. In 1919 it had a population of 5,700, of which 1,790, or thirty-one percent, was African American.