Complex sentence: German South-West Africa (DSWA) was a colony of the German Empire from 1884 until 1915, with an area of 835,100 km², it was one and a half times the size of the mainland German Empire in Europe at the time.
Split into simpler sentences: German South-West Africa (DSWA) was a colony of the German Empire from 1884 until 1915. With an area of 835,100 km², it was one and a half times the size of the mainland German Empire in Europe at the time.