Complex sentence: He remained in Chicago until his appointment by President Grant, associate justice, the Supreme Court of Washington Territory, 1870-79, he settled at Olympia, and then in 1880 he was commissioned chief justice, at which time he removed to Seattle.
Split into simpler sentences: He remained in Chicago until his appointment by President Grant to associate justice on the Supreme Court of Washington Territory, 1870-79. He settled at Olympia, and in 1880 he was commissioned chief justice, at which time he moved to Seattle.