Complex sentence: Around this time he took up etching and was accepted into the Royal Society of Painters and Etchers (RE) in 1885; he was already a member of the Royal Scottish Watercolour Society (RSW) from 1884.
Split into simpler sentences: Around this time he took up etching and was accepted into the Royal Society of Painters and Etchers (RE) in 1885. He was already a member of the Royal Scottish Watercolour Society (RSW) from 1884.