Complex sentence: Donovan died from complications of vascular dementia on February 8,1959, at Walter Reed Army Medical Center, in Washington, D.C. at the age of 76, and is buried in Section 2 of Arlington National Cemetery.
Split into simpler sentences: Donovan died from complications of vascular dementia on February 8,1959 at Walter Reed Army Medical Center in Washington, D.C. aged 76. He is buried in Section 2 of Arlington National Cemetery.