Complex sentence: The Treaty of Washington with the Creek in 1805 extended the state's western boundary to the Ocmulgee River, and a legislative act on June 26,1806, added some of this additional land to both counties.
Split into simpler sentences: The Treaty of Washington with the Creek in 1805 extended the state's western boundary to the Ocmulgee River. A legislative act on June 26,1806, added some of this additional land to both counties.