Complex sentence: In summer 1861, Varina and her husband moved to Richmond, Virginia, the new capital of the Confederacy, and lived in the Presidential Mansion there, during the War (1861--1865).
Split into simpler sentences: In summer 1861, Varina and her husband moved to Richmond, Virginia, the new capital of the Confederacy. They lived in the Presidential Mansion there during the War (1861--1865).