Complex sentence: Her grandmother, Yevdokiya Grigorievna, died a month later of heart failure and was buried in what is today's Piskaryovskoye Memorial Cemetery where there is a memorial complex to the victims of the siege.
Split into simpler sentences: Her grandmother, Yevdokiya Grigorievna, died a month later of heart failure and buried in what is today's Piskaryovskoye Memorial Cemetery. There is a memorial complex to the victims of the siege.