Complex sentence: Clench left Ann Arbor in 1925 to take a position at the Kent Scientific Museum and then in 1926 he joined the Museum of Comparative Zoology where he remained until 1966.
Split into simpler sentences: Clench left Ann Arbor in 1925, to take a position at the Kent Scientific Museum. In 1926 he joined the Museum of Comparative Zoology, where he remained until 1966.