You are right about that and I will TRY to explain.
Our league (second division) consist of 2 periods. The 8 teams plays each other 4 times: twice in period 1, twice in period 2. The winners of each period play each other in 2 games for the championship and for promotion to the 1st division. If you win the championship, your season is over and you won't be able to qualify for the Europa League.
At the end of the season an overall standings (both periods combined) is made.
The 2nd, 3th an 4th placed teams are qualified for Playoff 2. I will explain this system later.
The 5th, 6th, 7th and 8th placed teams of the overall standings play Playoff 3. The points you scored are cut in half, so if you had 30 point in the overall standings you now have 15. The 4 teams play each other 2 times. The team that finishes last in PO3 are relegated, the other teams are safe.
Now for the 1st division: The 16 teams play each other 2 times. At the end of the season the 1st, 2nd, 3th, 4th, 5th and 6th placed teams play Play-off 1. Their total points are also cut in half. They play each other 2 times. The team that wins PO1 wins the championship and they are qualified for the Champions League's group stage. The team that comes in second is qualified for the third qualifying round of the CL. The 3th placed team is qualified for the last qualifying round of the Europa League, the 4th placed team is qualified for the 3 qualifying round of the EL. The 5th placed team has to face the winner of Playoff 2 to qualify for the second qualifying round of the EL. For the 6th placed team the season is over.
Meanwhile the 7th to 15th placed teams of the regular season play Playoff 2 with the 2nd, 3th and 4th placed teams of second division. The teams are placed in 2 groups (A & B) and play each other 2 times. In this group stage all teams start with 0 points. The winners of both groups play each other in 1 game. The winner of this game plays the 5th placed team of PO1. The winner of this game is qualified for the second qualifying round of the Europa League.
The 16th placed team of 1st division is automaticlly relegated. They don't play in any of the playoffs.
At this moment this is the overall standings in second division:
1. KV Mechelen 34 points
2. Beerschot 30 points
3. Union 28 points
4. Lommel 22 points*
5. Westerlo 20 points
6. OHL 15 points*
7. Roeselare 14 points
8. Tubeke 12points
Lommel and OHL have a game in hand. This game was postponed due to the death of Khun Vichai and will be played on december 4. This game is part of the first period, which is already won by KV Mechelen, but is still important for the overall standings. We still can qualify for PO2 but we have to start winning games!
The playoffs will be played from the last weekend of March to the last weekend of May.
Believe it or not, this is the easiest way to explain this system . If you have any questions, I'll be happy to explain.