Complex sentence: Caro Dana Dawes, née Blymyer (January 6,1866--October 3,1957), was the wife of Vice President Charles Dawes, who served from 1925 to 1929, and was the Second Lady of the United States during that period.
Split into simpler sentences: Caro Dana Dawes, née Blymyer (January 6,1866--October 3,1957), was the wife of Vice President Charles Dawes, who served from 1925 to 1929. Therefore, she was the Second Lady of the United States during that period.