Simplify the following text for a Grade 9 native English-speaking person.
Original: The application as an anesthetic turned out to be one of the few safe uses of cocaine , and as reports of addiction and overdose began to filter in from many places in the world , Freud 's medical reputation became somewhat tarnished .
Simplified: Reports of addiction and overdose began to come from many parts of the world . Freud 's medical reputation became somewhat tarnished because of this early ambition .