Simplify the following text for a Grade 13 native English-speaking person.
Original: Alois Alzheimer , German Psychiatrist , is credited with the first published case of `` presenile dementia '' , which Kraepelin would later identify as Alzheimer 's disease .
Simplified: Alzheimer is credited with identifying the first published case of `` presenile dementia '' , which Kraepelin would later identify as Alzheimer 's disease .