Haskell doesn't forbid multiple arguments. It has two many ways to take multiple arguments. First is currying. The second is through tuples. Or you can make your own type like a tuple and have a function take that type.

(+) :: Int -> (Int -> Int)
This addition function takes an Int which returns a function which takes an Int which returns an Int. I put the brackets in for illustration.

(+) :: (Int,Int) -> Int
This addition function takes a tuple of two Ints and returns an Int.

(+) :: (Pair Int Int) -> Int
This takes a type called Pair which holds two Ints and returns an Int.

The second way is a lot like how C takes arguments. And Haskell can do what >>22 shows too, so currying is less a limitation than a feature or an integral part of the language because Haskell comes from typed lambda calculus.