Complex sentence: But 6 years late, in reference to Prechter's 1987 forecast for the Dow Jones Industrial Average, in which technical analyst David Aronson wrote that the "Elliott Wave Principle" as espoused by Prechter is not a legitimate theory.
Split into simpler sentences: But 6 years late, in reference to Prechter's 1987 forecast for the Dow Jones Industrial Average. Technical analyst David Aronson has said that the "Elliott Wave Principle", as espoused by Prechter, is not a legitimate theory.