Complex sentence: Other fossils belonging to that species were found in the first half of the twentieth century in Sangiran and Mojokerto, both in Java; older than those Dubois found, they are also considered part of the species "Homo erectus".
Split into simpler sentences: Other fossils belonging to that species were found in the first half of the twentieth century in Sangiran and Mojokerto, both in Java. Older than those Dubois found, they are also considered part of the species "Homo erectus".