The Contacts app uses an intelligent merge feature to combine contact information from various sources (Gmail, Microsoft® Exchange, Facebook, new entries, etc.). If contact information was joined in error, the information can be separated back into individual contacts.
From a Home screen, navigate: Apps icon > People .
Tap Phonebook (located in the top-left), then tap All contacts.
Tap a contact.
Tap Menu (located in the upper-right).
Do one of the following:
To link a contact:
Tap Other Contacts to link to other people.
Other available sources may be displayed as well.
Tap the Link icon to the right of the contact to link.
Tap Done (located at the bottom).
To unlink a contact:
Tap the Linked icon (located to the right) of the contact to unlink.