Complex sentence: Abigail remarried and moved out of the house, but it remained in the family, and she returned to it after her second husband's death, living with her son's family until her own death in 1791.
Split into simpler sentences: Abigail remarried and eventually moved out of the house, but it remained in the family. She returned to it after her second husband's death, living with her son's family until her own death in 1791.