Complex sentence: After the Civil War, Omohundro left Virginia at age 19 for Florida, then after a short time moved on to Texas arriving at a ranch near Brazos where he began his life as a Texas cowboy.
Split into simpler sentences: After the Civil War, Omohundro left Virginia at age 19 for Florida. After a short time he moved on to Texas, arriving at a ranch near Brazos, where he began his life as a Texas cowboy.