Simplify the following text for a Grade 12 native English-speaking person.
Original: The Franco-Prussian War of 1870 â `` 71 showed that even Red Cross actors ( in this case National Societies ) can be so bound by nationalism that they are unable to sustain neutral humanitarianism .
Simplified: The Franco-Prussian War of 1870-71 showed that even National Red Cross Societies can be biased and not maintain neutral humanitarianism .