Simplify the following text for a Grade 9 native English-speaking person.
Original: He died of senile dementia in the Fremantle Lunatic Asylum ( now the Fremantle Arts Centre building ) on 13 August 1900 , and was buried in Fremantle Cemetery .
Simplified: He died of senile dementia in the Fremantle Lunatic Asylum ( now the Fremantle Arts Centre building ) on 13 August , 1900 . He was buried in Fremantle Cemetery .