Complex sentence: He served from January 4,1925 to 1933 and then on March 13,1933 appointed himself to the United States Senate to fill the vacancy caused by the death of Thomas J. Walsh.
Split into simpler sentences: He served from January 4,1925 to 1933. On March 13,1933, Erickson appointed himself to the United States Senate to fill the vacancy caused by the death of Thomas J. Walsh.