Complex sentence: Julia Romana Anagnos, Florence Howe Hall, Henry Marion Howe, Laura E. Richards, Maud Howe Elliott and Samuel Gridley Howe, Jr., the youngest, who died at age 3 from diphtheria.
Split into simpler sentences: Julia Romana Anagnos, Florence Howe Hall, Henry Marion Howe, Laura E. Richards, Maud Howe Elliott. Her sixth and youngest child, Samuel Gridley Howe, Jr., died at age 3 from diphtheria.