Simplify the following text for a Grade 7 native English-speaking person.
Original: He multiplied the French interventions abroad , especially in Crimea , in Mexico and Italy but was unseated following defeat in the Franco-Prussian war of 1870 and his regime was replaced by the Third Republic .
Simplified: Louis-Napol Ã on was removed after the defeat in the Franco-Prussian war of 1870 . The Third Republic replaced his regime .