Complex sentence: Realizing he has become fluent in the language, he runs back to the gendarme and tells him about the winemakers, who are subsequently swiftly arrested and imprisoned, and Bart finishes his stay in France being hailed as a hero.
Split into simpler sentences: Realizing he has become fluent in the language, he runs back to the gendarme and tells him about the winemakers. The winemakers are swiftly arrested and Bart finishes his stay in France being hailed as a hero.