Answer:
Pronouns make a sentence easier to say and less tedious to the ear. For example:
John took John's car to pick up John's mother and take John's Mother to an appointment.
John took his car to pick up his mother and take her to an appointment.
Gone With The Wind was a great movie; Gone With The Wind won many awards and Gone With The Wind is still enjoyed by audiences today.
Gone With The Wind was a great movie; it won many awards and it's still enjoyed by audiences today.