Complex sentence: He married Princess Irina of Russia, the Tsar's niece, on February 22,1914 in the Anichkov Palace in Saint Petersburg, and the marriage was extremely well-matched and very happy.
Split into simpler sentences: He married Princess Irina of Russia, the Tsar's niece, on February 22,1914 in the Anichkov Palace in Saint Petersburg. The marriage was extremely well-matched and very happy.