DECLARE @Expiry_Date DATETIME = '2012-12-25 00:00:01.003', @Prod VARCHAR(MAX), @Product_Name VARCHAR(10) = 'Vehicles'

SET @Prod=@Product_name + RTRIM(@Product_name)

+ ' (Expires '+RTRIM(DATENAME(MM, @Expiry_Date ) + RIGHT(CONVERT(VARCHAR(12), @Expiry_Date ,107),9))+ ')'

SELECT @Prod

Output is

VehiclesVehicles (Expires December 25, 2012)