Complex sentence: The "Bund Naturschutz" wants to exert pressure on the Bundesländer to designate several areas as nature reserves and has appealed for donations from the public to enable "Bund Naturschutz" to acquire properties along the "Green Belt".
Split into simpler sentences: The "Bund Naturschutz" wants to exact pressure on the Bundesländer to mark several areas as nature reserves. The public is called upon to donate money to enable "Bund Naturschutz" to acquire properties along the "Green Belt".