Complex sentence: Returned, in 1899 she married the Russian Prince Lwoff at Prague, and lived then at Berlin, Germany, and Nice, France, to move defenitley to New York City in 1908.
Split into simpler sentences: Returned, in 1899 she married the Russian Prince Lwoff at Prague. Back, she lived at Berlin, Germany, and Nice, France, to move defenitley to New York City in 1908.