Complex sentence: Hugh McGary gave testimony that he observed Andrew Jackson "bedding together" with Rachel Donelson-Robards-Jackson in July 1790, who had previously married Captain Lewis Robards of Harrodsburg, Kentucky without divorcing him.
Split into simpler sentences: Hugh McGary gave testimony that he observed Andrew Jackson "bedding together" with Rachel Donelson-Robards-Jackson in July 1790. Rachel had married Captain Lewis Robards of Harrodsburg, Kentucky without divorcing him.