Complex sentence: Morse published his first large work the year of his retirement, "The Trade and Administration of the Chinese Empire", then the first volume of "The International Relations of the Chinese Empire" in 1910 (the third and last volume in 1918).
Split into simpler sentences: Morse published his first large work in 1908, the year of his retirement, "The Trade and Administration of the Chinese Empire". The first volume of "The International Relations of the Chinese Empire" came out in 1910 (the third and last volume in 1918).