Complex sentence: She left her parents at about age 18 and moved with her liberated aunt Sarah Smith to Kirtland, Ohio, where at age 20 she met her future husband Newel K. Whitney.
Split into simpler sentences: She left her parents at about age 18 and moved with her liberated aunt Sarah Smith to Kirtland, Ohio. When she was 20 she met her future husband Newel K. Whitney.