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, tap Contacts (located at the bottom).
If unavailable, navigate: Apps > Contacts.
Tap a contact.
Tap the Menu icon (located in the lower-left).
Tap one of the following:
Tap Link contact.
Tap the contact to link.
Tap Separate contact then tap (located to the right).