Complex sentence: He died 3 months after her elder sister, Princess Bahurada Manimaya died, and 6 months after his younger brother, Prince Siriraja Kakudhabhandh, who died on 31 May 1887.
Split into simpler sentences: He died 3 months after her elder sister, Princess Bahurada Manimaya died. And 6 months after his younger brother, Prince Siriraja Kakudhabhandh, who died on 31 May 1887.