Complex sentence: Born in Saint Petersburg or Moscow, he was the second surviving son of Count Nikolai Nikitich Demidov and Baroness Elisabeta Alexandrovna Stroganova; he grew up in Paris, where his father was ambassador.
Split into simpler sentences: Born in Saint Petersburg or Moscow, he was the second surviving son of Count Nikolai Nikitich Demidov and Baroness Elisabeta Alexandrovna Stroganova. He grew up in Paris, where his father was ambassador.