Complex sentence: Swanzey was not constantly ill, but she never did enjoy physically robust health during her life, and traveled to several places in her young adulthood seeking a more comfortable climate, but she always returned to South Dakota.
Split into simpler sentences: Swanzey was not constantly ill, but she never did enjoy physically robust health during her life. She traveled to several places in her young adulthood seeking a more comfortable climate, but always returned to South Dakota.