Original sentence: The first 15 minutes parking will be free; 2 guilders for each hour; and after four hours, 1 guilder with a maximum of 20 guilders per day
Edited sentence: Unfortunately the first 15 minutes parking is not free anymore because now you have to pay 1 guilder for the first 30 minutes and 1 guilder for each 30 minutes more; 2 guilders for each hour; and after four hours, 1 guilder with a maximum of 20 guilders per day