Complex sentence: In 1917, he resigned his job at the Leeds City Art Gallery, and he worked for the Admiralty as an administrative officer (AAO) until 1919, when he opened the Adelphi Gallery to exhibit small pieces by Ginner, Edward Wadsworth an David Bomberg.
Split into simpler sentences: In 1917, he resigned his job at the Leeds City Art Gallery, and he worked for the Admiralty as an administrative officer (AAO) until 1919. After leaving the Admirality, Rutter opened the Adelphi Gallery to exhibit small pieces by Ginner, Edward Wadsworth an David Bomberg.