Complex sentence: Oranjemund is another mining town along this coast, situated in Namibia but very much on the border, as the name suggests, it is at the mouth of the Orange River which forms the border between South Africa and Namibia.
Split into simpler sentences: Oranjemund is another mining town along this coast, situated in Namibia but very much on the border. As the name suggests, it is at the mouth of the Orange River which forms the border between South Africa and Namibia.