Complex sentence: Confucius commended Nangong Kuo as a gentleman who reveres "de" (virtue), and gave his niece, daughter of his elder brother Mengpi, to him in marriage.
Split into simpler sentences: Confucius commended Nangong Kuo as a gentleman who reveres "de" (virtue). He gave his niece, daughter of his elder brother Mengpi, to Nangong Kuo in marriage.