Complex sentence: Hammer died of bone marrow cancer in December 1990, aged 92 in Los Angeles, and was buried in Westwood Village Memorial Park Cemetery, across the street from his Occidental building on Wilshire Boulevard.
Split into simpler sentences: Hammer died of bone marrow cancer in December 1990, aged 92. He died in Los Angeles, California and rested in Westwood Village Memorial Park Cemetery, acrose the street from his Occidental building on Wilshire Boulevard.