The Contacts app uses an intelligent merge feature to combine contact info from various sources (GmailTM, Microsoft® Exchange, Facebook®, new entries, etc.). If contact info was joined in error it can be separated back into individual contacts.
From a Home screen, navigate: Apps > Contacts.
From the Contacts tab, select a contact.
Tap the Menu icon (located below the display).
Do one of the following:
To link a contact:
Tap Join contacts.
Select a contact then tap Join.
To unlink a contact:
Tap Separate (to the right of the corresponding contact).