Complex sentence: The Blue Line is based on the deployment of the IDF prior to March 14 1978, not to be confused with the Green Line, established in 1949, which is the armistice line of the 1948 Arab-Israeli War.
Split into simpler sentences: The Blue Line is based on the deployment of the IDF prior to March 14 1978. It should not be confused with the Green Line, established in 1949, which is the armistice line of the 1948 Arab-Israeli War.