Add punctuation: The students came from the four Copenhagen high schools Rysensteen Gefion Zahle and Christianshavn which have been working together with common cultural and educational arrangements under the heading of CITYGYMNASIERNE City Schools
A: The students came from the four Copenhagen high schools (Rysensteen, Gefion, Zahle and Christianshavn) which have been working together with common cultural and educational arrangements under the heading of CITY-GYMNASIERNE (City Schools).

Add punctuation: Although air pollution affects everyone it does not affect everyone to the same extent and in the same way
A: Although air pollution affects everyone, it does not affect everyone to the same extent and in the same way.

Add punctuation: and Baalath and all the storecities that Solomon had and all the cities for chariots and the cities for the horsemen and all that Solomon desired to build in Jerusalem and on Lebanon and in all the land of his dominion
A:
and Baalath, and all the store-cities that Solomon had, and all the cities for chariots, and the cities for the horsemen, and all that Solomon desired to build in Jerusalem, and on Lebanon, and in all the land of his dominion.