Searching for Sigvart Olsen

Hi, Im looking for some history on Sigvart Olsen, born April 8th 1869 in oslo. Immigrated to South Dakota when he was 19 years old. Siblings Mrs Nellie Newstrum, Mrs Johanna Haug, Mrs Gena Rude, Halvor Olsen, Hans Olsen and Ole Olson. Any info would be greatly appreciated