Complex sentence: A nomenclator (plural nomenclators; derived from the Latin "nomen"-name + "calare"-to call), in classical times, referred to a slave whose duty was to recall the names of persons his master met during a political campaign.
Split into simpler sentences: A nomenclator (plural nomenclators) is derived from the Latin "nomen"-name + "calare"-to call. In classical times it referred to a slave whose duty was to recall the names of persons his master met during a political campaign.