Complex sentence: Further construction in the 1970s also built up the remaining space on the main campus of Rotherbaum quarter, with the "Geomatikum" building being the distinctive addition for that decade; since then, new properties were opened in other parts of Hamburg.
Split into simpler sentences: Further construction in the 1970s also built up the remaining space on the main campus of Rotherbaum quarter, with the "Geomatikum" building being the distinctive addition for that decade. Since then, new properties were opened in other parts of Hamburg.