Complex sentence: He is the great great-grandson of Emperor Nicholas I and Empress Alexandra Feodorovna in a straight male line, and through her grandmother Grand Duchess Xenia Alexandrovna he is a great-grandson of Emperor Alexander III and Empress Maria Feodorovna.
Split into simpler sentences: He is the great-great-grandson of Emperor Nicholas I and Empress Alexandra Feodorovna in a straight male line. Through his grandmother, Grand Duchess Xenia Alexandrovna, he is a great-grandson of Emperor Alexander III and Empress Maria Feodorovna.