The Contacts app uses an intelligent merge feature to combine contact info from various sources (Gmail, 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 icon > Contacts.
From the ALL CONTACTS tab (located at the top), tap a contact.
Tap the Edit icon (located at the top).
Tap the Menu icon (located in the upper-right).
Do one of the following:
To link a contact:
Tap the contact to link.
Tap the left arrow icon (located in the upper-left).