Complex sentence: The Mississippi statehood convention of 1817 met in Washington at the Methodist Meeting House (which was purchased by Jefferson College in 1830) and after Mississippi was admitted to the union in 1817, the legislature met once in Washington, and afterwards in Natchez.
Split into simpler sentences: The Mississippi statehood convention of 1817 met in Washington at the Methodist Meeting House (which was purchased by Jefferson College in 1830). After Mississippi was admitted to the union in 1817, the legislature met once in Washington, and afterward in Natchez.