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 the Menu icon (located in the upper-right).
Do one of the following:
To link a contact:
Tap the Broken link icon (located to the right) of the contact to link.
Tap Other Contacts to link to other people.
Tap Done (located at the bottom).
To unlink a contact:
Tap the Link icon (located to the right) of the contact to unlink..