Samsung Galaxy S4 User Manual page 128

Note: The information is still maintained in both entries, but displays
in one record for easier viewing when you link the contacts.
Important! It is the first contact image that is displayed for both, and
the first contact's name that is used.
For example: If Amy (original entry) is joined with Julie
(second entry). Julie seems to disappear and only Amy
remains. Tap the Amy entry (showing the Amy image) to
view both.
5. Tap the main linked contact to view the contact information
you linked.
Unjoining a Contact
1. From the Home screen, tap
2. Tap the joined contact name.
3. Tap the Connection area.
– or –
Press
4. Tap
The contacts are "unjoined" or separated and no longer
display in the merged record screen. Both contacts now go
back to being separately displayed.
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and then tap Separate contact.
next to the entry you want to unjoin and select OK.
(Contacts).