Complex sentence: In 1972, Rankin--by then in her nineties--considered mounting a third House campaign to gain a wider audience for her opposition to the Vietnam War; but she died on May 18,1973, age 92, in Carmel, California.
Split into simpler sentences: In 1972, Rankin--by then in her nineties--even considered mounting a third House campaign to gain a wider audience for her opposition to the Vietnam War. Rankin died on May 18,1973, age 92, in Carmel, California.