Complex sentence: In 1805, the Lower Creeks ceded their lands east of the Ocmulgee to Georgia, with the exception of the sacred burial mounds of the Ocmulgee Old Fields, and allowed a Federal Road linking New Orleans to Washington, D.C. to be built through their territory.
Split into simpler sentences: In 1805, the Lower Creeks ceded their lands east of the Ocmulgee to Georgia, with the exception of the sacred burial mounds of the Ocmulgee Old Fields. They allowed a Federal Road linking New Orleans to Washington, D.C. to be built through their territory.