Complex sentence: Caulaincourt's famous memoir, "With Napoleon in Russia" was lost for years and finally unearthed after World War I. Many years of restoration followed and it was finally published for the first time in 1933.
Split into simpler sentences: Caulaincourt's famous memoir, "With Napoleon in Russia" was lost for years and finally rediscovered following the First World War. After many years of work restoring the text it was published for the first time in 1933.