Complex sentence: The ("Later Collection Continued") was an imperial anthology of Japanese waka; it was finished in 1251 CE, three years after the Retired Emperor Go-Saga first ordered it in 1248.
Split into simpler sentences: The ("Later Collection Continued") was an imperial anthology of Japanese waka poetry. It was finished in 1251 CE, three years after the Retired Emperor Go-Saga first ordered it in 1248.