English Senior High about 2 yearsago

下から4行目のas can〰︎の所なのですが、この文構造がわからないので教えて頂きたいです。主語が省略されているのでしょうか...？

Park is enormous in size and covers over 1.5 million hectares, and the Reserved Zone is another 260,000 hectares. The reserve is made up of 13 ecological areas, thanks to a range of altitude from 200 to 4,000 meters. As can be expected from a park of this scale, the amount of flora and fauna is breathtakingly enormous. There are no particular limits to the number of visitors to the Reserved Zone, but the costly expense to visit the place naturally curbs the number of visitors. 制限