Complex sentence: The Zendian Problem was a series of problems in traffic analysis and cryptanalysis devised by Lambros D. Callimahos as part of a course taught to National Security Agency cryptanalysts, whose graduates became members of the Dundee Society.
Split into simpler sentences: The Zendian Problem was a series of problems in traffic analysis and cryptanalysis devised by Lambros D. Callimahos as part of a course taught to National Security Agency cryptanalysts. It was part of a course whose graduates became members of the Dundee Society.