Complex sentence: The final was held in the form of a round-robin tournament, matches between people who had already played each other in the group stage did not take place, but the results of those group matches were taken into account.
Split into simpler sentences: The final was held in the form of a round-robin tournament. Matches between people who had already played each other in the group stage did not take place, but the results of those group matches were taken into account.