Complex sentence: Whitman referred to his visit with Heatly in his final suicide note, writing, I talked with a Doctor once for about two hours and tried to convey to him my fears that I felt come ("sic") overwhelming violent impulses.
Split into simpler sentences: Whitman referred to his visit with Heatly in his final suicide note. He said, I talked with a Doctor once for about two hours and tried to convey to him my fears that I felt come ("sic") overwhelming violent impulses.