Haskell - how can you access a list within a list using recursion

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Haskell

I am trying to access a list within a list using recursion. For example : you have as an input [[1,2], [2, 3]] and I trying to access every element within that input as taking the head [1,2] and now I would like to access 1 and after 2.

What I have tried:

I have tried the following:

function_name input
| [x:xs] <- head input, condition (x > 2) = function_name (tail input)
| otherwise = function_name(tail input)

Any other tips or models to solve this?