Complex sentence: On March 7, the Memphis "Daily Appeal" wrote that the abolitionists were attempting to deprive the South of territories won during the U.S.-Mexican War, using the argument that the slave states had furnished twice as many volunteers as the free states and territories.
Split into simpler sentences: On March 7, the Memphis "Daily Appeal" wrote that the abolitionists were attempting to deprive the South of territories won during the U.S.-Mexican War. It used the argument that the slave states had furnished twice as many volunteers as the free states and territories.