Complex sentence: In 1899 he published the first volume of a "History of the American Revolution", which was completed (3 vols.) in 1905; in the latter year, as Interludes in Prose and Verse, he republished his early classical jeux d'esprit and Indian pieces.
Split into simpler sentences: In 1899 he published the first volume of a "History of the American Revolution", which was completed (three volumes) in 1905. In the latter year, as Interludes in Prose and Verse, he republished his early classical jeux d'esprit and Indian pieces.