Complex sentence: His mother was Alexandrina Ghika, née Alexandrina Moret de Blaremberg, and the grandson of the last ruler of Moldavia, Prince Gregory V Ghika (who ruled from 1849-1856).
Split into simpler sentences: His mother was Alexandrina Ghika, née Alexandrina Moret de Blaremberg. He was the grandson of the last ruler of Moldavia, Prince Gregory V Ghika (who ruled from 1849-1856).