1. He retired from baseball in 1999.
2. He retired from a baseball player in 1999.
3. He retired from his job in 1999.
4. He retired from throwing balls in 1999.
(Are they alll grammatical?)
5. He was born in Flint, Michigan, America.
6. He was born in Flint, Michigan in America.
7. He was born Flint, Michigan, in America.
(Are these expressions grammatical?)
1 and 3 are best. 2 is incorrect and 4 is silly.
5 and 7 are grammatical But America is not a country. They should all be Flint, Michigan, United States.