Complex sentence: In 1598, Georg Braun and Franz Hogenberg published the oldest known view of Luxembourg City, a copper engraving that appeared in "Civitates orbis terrarum" (Cologne, 1598).
Split into simpler sentences: In 1598, Georg Braun and Franz Hogenberg published the oldest known view of Luxembourg City. The copper engraving appeared in "Civitates orbis terrarum" (Cologne, 1598).