Complex sentence: The father's quota is highly controversial, and the largest opposition parties, the Conservative Party and the Progress Party, have decided to abolish it, instead letting families decide for themselves how to divide the parental leave period.
Split into simpler sentences: The father's quota has been a highly controversial topic, and the largest opposition parties, the Conservative Party and the Progress Party, has had a wish to abolish it completely. They feel that the individual families should be able to decide for themselves how they would like to divide the parental leave period.