Complex sentence: NASL procedure also called for the box score to show an additional "goal" given to the winning side of a shoot-out, though not get in the "Goals For" column of the league table.
Split into simpler sentences: NASL procedure also called for the box score or score-line to show an additional "goal" given to the winning side of a shoot-out. This "victory goal" however was not credited in the "Goals For" column of the league table.