Complex sentence: Six tracks from the Knickerbocker Arena concert were previously released on "Dozin' at the Knick", and three tracks from the Nassau Coliseum concert were previously released on "Without a Net".
Split into simpler sentences: Six tracks from the Knickerbocker Arena concert were previously released on "Dozin' at the Knick". Three tracks from the Nassau Coliseum concert were previously released on "Without a Net".