gistfile1.php

        $dataArray = array();
         $data = array(
            'Offer' => array('id' => 2, 'name' => 'ExampleName'),
            'Stat' => array('Stat1' => 1, 'Stat2' => 2),
            'Country' => array('Name' => array('z','name2'))
         );
          array_push($dataArray,$data);
         
          $data = array(
            'Offer' => array('id' => 2, 'name' => 'ExampleName'),
            'Stat' => array('Stat1' => 1, 'Stat2' => 3),
            'Country' => array('Name' => array('a','name2'))
         );
          array_push($dataArray,$data);
         
         print_r(Set::sort($dataArray,'{n}.Country.Name','asc')); 
         
/* Array (
[0] => Array (
        [Offer] => Array (
        [id] => 2
        [name] => ExampleName
      )
        [Stat] => Array (
        [Stat1] => 1
        [Stat2] => 3
      )
        [Country] => Array (
        [Name] => Array (
        [0] => a
        [1] => name2
    )
  )
)
[1] => Array (
      [Offer] => Array (
      [id] => 2
      [name] => ExampleName
    )
      [Stat] => Array (
      [Stat1] => 1
      [Stat2] => 2
    )
      [Country] => Array (
      [Name] => Array (
      [0] => z
      [1] => name2
    )
  )
)
)*/