Transact SQL :: String Split After The Space

DECLARE @FullName        VARCHAR(100)
SET @FullName = 'Vauxhall Adam Rocks AIR Vauxhall'

SELECT LEFT(@FullName, NULLIF(CHARINDEX(' ', @FullName)  -1, -1)) AS [FirstName],
       RIGHT(@FullName, ISNULL(NULLIF(CHARINDEX(' ', REVERSE(@FullName)) - 1, -1), LEN(@FullName))) AS [LastName]

This is only gives first and last not first and middle 
 
DECLARE @FullName        VARCHAR(100)
SET @FullName = 'Vauxhall Adam Rocks AIR Vauxhall'
SELECT 
STUFF(@FullName,charindex(' ',SUBSTRING(@FullName,5,LEN(@FullName)))+5,LEN(@FullName),'') [Firstname1],
  STUFF(@FullName,1,charindex(' ',SUBSTRING(@FullName,5,LEN(@FullName)))+4,'') Lastname1

Not right as it gives 

Vauxhall 
Adam Rocks AIR Vauxhall

Ideally the result should be 

Vauxhall
Adam Rocks AIR