A good doctor treats sick people well. his patients feel good/ a good writer interesting books .his books are sold in

A good doctor treats sick people well. His patients feel good. —

A good doctor’s patients, who treats sick people well, feel good.

A good doctor, whose patients feel good, treats sick people.

A good writer interesting books .His books are sold in many countries. — A good writer’s books, who writes interesting books, are sold in many countries.

A good writer, whose books are sold in many countries, writes interesting books.

A good singer chooses wonderful songs. His songs are liked and sung everywhere. — A good singer’s songs, who chooses wonderful songs, are liked and sung everywhere.

A good singer, whose songs are liked and sung everywhere, chooses wonderful songs.