Generate a correctly punctuated version of the following text: The Denmark Expedition is also special because it mapped the last unknown places in Northeast Greenland Unfortunately it also cost the lives of three people among them the leader of the expedition Ludvig MyliusErichsen
The Denmark Expedition is also special because it mapped the last unknown places in Northeast Greenland. Unfortunately, it also cost the lives of three people, among them the leader of the expedition, Ludvig Mylius-Erichsen.