Complex sentence: He was a Court of Appeals Clerk for Leon County, Florida from 1841 to 1843 and then became U.S. Territorial Secretary for the Territory of Florida from 1843 to 1846.
Split into simpler sentences: He was a Court of Appeals Clerk for Leon County, Florida from 1841 to 1843. He then became U.S. Territorial Secretary for the Territory of Florida from 1843 to 1846.