Complex sentence: The poem would remain unpublished for another six years, but was first published in "The New York Weekly" on August 5,1872, and by Loring in 1875 in "Grand'ther Baldwin's Thanksgiving with Other Ballads and Poems".
Split into simpler sentences: The poem would remain unpublished for another six years, but was first published in "The New York Weekly" on August 5,1872. A. K. Loring published it in 1875 in Alger's "Grand'ther Baldwin's Thanksgiving with Other Ballads and Poems".