The Contacts app uses an intelligent merge feature to combine contact info from various sources (Gmail™, Microsoft® Exchange, new entries, etc.). If contact info was joined in error, it can be separated back into individual contacts.
From a Home screen, swipe up from the center of the display to access the apps screen.
Tap Contacts .
Tap a contact.
Tap the Menu icon (upper-right).
Tap the contact you want to link to the contact selected in step 3.
To unlink a contact, tap a linked contact.
Tap the Menu icon.
Tap View linked contacts.
Tap ADD to link more contacts together under the same entry.