Complex sentence: Following the initial classification, the list was updated in 1969,1986,1996 and most recently in 2006, although after the entire classification was declared invalid following confusing legal turns, the 1996 version of the classification has been reinstated for the vintages 2006 to 2009.
Split into simpler sentences: Following the initial classification, the list was updated in 1969,1986,1996 and most recently in 2006. However the 2006 classification was declared invalid following a series of legal actions, and the 1996 version of the classification has been reinstated for the vintages from 2006 to 2009.