Complex sentence: Rhode Island Deputy Governor and Chief Justice John Gardner was a great grandson of Holmes, but his best known descendant was United States President Abraham Lincoln, whose connection with Holmes was published by J. T. Holmes in his 1915 genealogy of the family.
Split into simpler sentences: Rhode Island Deputy Governor and Chief Justice John Gardner was a great grandson of Holmes. His best known descendant was United States President Abraham Lincoln, whose connection with Holmes was published by J. T. Holmes in his 1915 genealogy of the family.