Complex sentence: Late in his life, he was awarded the name "Wú" 吳 by the Imperial court, which approximated the pronunciation of the first syllable of his Manchu name, which name has been used by his descendants ever since.
Split into simpler sentences: Late in his life, he was awarded the name "Wú" 吳 by the Imperial court, which approximated the pronunciation of the first syllable of his Manchu name. The name has been used by his descendants ever since.