Complex sentence: Upon his death, his remains was quickly cremated at the same day and his ashes was later brought back to Japan-ruled Korea, and later re-interred at Seoul National Cemetery, years after the Korean independence.
Split into simpler sentences: Upon his death, his remains was cremated on the same day; his ashes was later brought back to Japanese-occupied Korea. His remains were last re-interred at Seoul National Cemetery, years after Korean independence.