Complex sentence: In 1842 he was appointed assistant geologist on the British Geological Survey, and in that service he remained for forty-six years, becoming director for England and Wales in 1872, and retiring in 1888.
Split into simpler sentences: In 1842 he was appointed assistant geologist on the British Geological Survey. He remained in that service for forty-six years, becoming director for England and Wales in 1872, and retiring in 1888.