Complex sentence: In 2007, Finland issued a €10 Adolf Erik Nordenskiöld and Northeast Passage commemorative coin to celebrate the 175th anniversary of Nordenskiöld's birth and his discovery of the northern sea route.
Split into simpler sentences: In 2007, Finland issued a €10 Adolf Erik Nordenskiöld and Northeast Passage commemorative coin. This issue celebrates the 175th anniversary of Nordenskiöld's birth and his discovery of the northern sea route.