Schønemann in Oslo

My grandfather Arthur C. A. Schønemann was born in Oslo in 1885. He and his wife Ragnhild came to America in 1909 and lived in New York and New Jersey. He returned to Norway sometime after 1934 without his wife. He remarried and stayed in Norway (probably the Oslo area) and died there in 1951 (we think). I have tried to find information about his second marriage and death on Digitalarkivet with no success. Would anyone have any suggestions for further research?