SrPeixinho

-- When your code grows too big for a line:

separateParens = foldr (\ head tail -> if head == '(' then head : ' ' : tail else if head == ')' then ' ' : head : tail else head : tail) []

-- Your natural instinct is to add new lines and comments:

separateParens =
    foldr (\ head tail -> 
        if head == '('
            then head : ' ' : tail     -- inserts space after left parens