Complex sentence: The poem was first published in the October 1838 issue of "The Knickerbocker", though it was attributed only to "L." Longfellow was promised five dollars for its publication, though he never received payment.
Split into simpler sentences: The poem was first published in the October 1838 issue of "The Knickerbocker". Although it was attributed only to "L." Longfellow was promised five dollars for its publication, though he never received payment.