Complex sentence: Vaux was one of eight founders of the Numismatic and Antiquarian Society, its senior vice-president, and from 1871 till his death treasurer of the American Association for the Advancement of Science.
Split into simpler sentences: Vaux was one of eight founders of the Numismatic and Antiquarian Society, its senior vice-president. From 1871 till his death he was treasurer of the American Association for the Advancement of Science.