Complex sentence: The final result, titled "The New Zealand Division 1916-1919, a popular history based on official records", was published in 1921 and remained the primary reference for New Zealand's contribution to the campaign on the Western Front for several decades.
Split into simpler sentences: The final result, titled "The New Zealand Division 1916-1919, a popular history based on official records", was published in 1921. It remained the primary reference for New Zealand's contribution to the campaign on the Western Front for several decades.