Complex sentence: Orginally the site of a German fort built in 1901, Okaukuejo now houses the Etosha Ecological Institute, founded in 1974; the round watchtower is a remnant of the fort.
Split into simpler sentences: Orginally the site of a German fort built in 1901, Okaukuejo now houses the Etosha Ecological Institute, founded in 1974. The round watchtower is a remnant of the fort.