Original sentence: Her mother went into a year-long mourning period.In April 1757, a year after she after she was born, her sister Frances died suddenly, and her father died that July.She was the youngest child of Martha and Daniel Custis.Two years after Daniel's death, Martha married George Washington
Edited sentence: Her mother married George Washington, two years later.She dealt with loss from a young age, when the year after she after she was born, her sister Frances and her father both died suddenly, in April and July respectively.She was the youngest child of Martha Dandridge and Daniel Parke Custis.This deeply impacted her, her brother John and her mother, the latter of whom went into a deep year-long mourning period