Add punctuation: 5 This Act shall not apply to the processing of data which is performed on behalf of the Folketing the Danish Parliament and its related institutions
A: (5) This Act shall not apply to the processing of data which is performed on behalf of the Folketing (the Danish Parliament) and its related institutions.

Add punctuation: But they were not on one of the biggest shelfs were the catch used to be the greatest
A: But they were not on one of the biggest shelfs, were the catch used to be the greatest.

Add punctuation: In principle a negociant buys wines from producers
A:
In principle, a negociant buys wines from producers.