Complex sentence: Another argument was that in its function as a shelter, the tunnel only had a capacity of 5,000 people, resulting in a cost of 60,000 kuna per person at the time, which was deemed too expensive by the committee.
Split into simpler sentences: Another argument was that in its function as a shelter, the tunnel only had a capacity of 5,000 people. At the time of the statement, the costs amounted to 60,000 kuna per person, which was deemed too expensive by the committee.