I'm not sure if Views nodes split module will be useful for your situation as @DnBase mentioned.
However, because you're using Views Field View; you can follow the following steps to achieve what you're looking for:
- Edit field view actual view (referenced view)
- Add
Global: Null
from CONTEXTUAL FILTERS menu

From the next dialog box that appear, select Hide view
from WHEN THE FILTER VALUE IS NOT AVAILABLE fieldset.
Then from WHEN THE FILTER VALUE IS AVAILABLE OR A DEFAULT IS PROVIDED fieldset, check Specify validation criteria
and select PHP Code
from validator dropdown menu
Then add the following code in PHP Validate code
field
From Action to take if filter value does not validate
dropdown menu select Hide view
Code:
if($argument == 1) {
return TRUE;
} else {
return FALSE;
}

- Now edit the main view
- Add
Global: View result counter
from FIELDS menu, then from field configuration dialog box, check Exclude from display
- Then edit
Global: View
field, from field configuration dialog box, add this replacement pattern [%counter]
into Contextual filters
field

By applying these steps, you'll notice that view field will only appear on first item.