Complex sentence: After the "Gazette" was moved, there was no newspaper in the area until 1813, when John B. Hood began publishing "The East Tennessee Gazette" at Rogersville.
Split into simpler sentences: After the "Gazette" was moved, there was no newspaper in the area for more than twenty years. Then, in 1813, John B. Hood began publishing "The East Tennessee Gazette" at Rogersville.