Complex sentence: Pinwell was an exhibitor at the Dudley gallery, and in 1869 was elected associate of the Royal Water-Colour Society and full member in 1870; to this gallery he contributed fifty-nine works.
Split into simpler sentences: Pinwell was an exhibitor at the Dudley gallery, and in 1869 was elected associate of the Royal Watercolour Society and full member in 1870. To this gallery he contributed fifty-nine works.