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.
Tap a contact.
Tap the Menu icon (located at the bottom-left).
Do one of the following:
To link a contact, tap Link contacts, select a contact then tap Done (located in the upper-right).
To unlink a contact, tap Unlink contacts then tap the Minus icon (located to the right of the contact ).