Complex sentence: He visited Florence, but returning to Genoa made the acquaintance of Joséphine de Beauharnais, and followed her to Milan, where he was well received by her husband, Napoleon Bonaparte.
Split into simpler sentences: He visited Florence, but returning to Genoa where he made the acquaintance of Joséphine de Beauharnais. He followed her to Milan, where he was well received by her husband, Napoleon Bonaparte.