How can I separate the grouped contacts?

From the Home screen, touch the Contacts Key in the Quick Keys bar.

Locate the contact then touch and hold the contact. The Context menu will open.

Touch Edit contact. If multiple contacts are joined under the same name, you can see each contact entry that was joined, listed separately within the Edit screen. Scroll the screen to view them.

To separate them, touch the Menu Key > Separate.

To confirm the selection, touch OK.