Complex sentence: Under Prussian influence, communities were formed also in Rome (1819), Naples (1826) and Florence (1899), while other German-speaking citizens established churches in Milano (1850), Sanremo (1870) and Genoa (1896).
Split into simpler sentences: Under Prussian influence, communities were formed in Rome (1819), Naples (1826) and Florence (1899). Finally, German-speaking citizens established churches in Milan (1850), Sanremo (1870) and Genoa (1896).