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Sure! Here's an example of a more complex PowerShell function that takes two inputs and returns one output:

```PowerShell
function Get-LongestWord ($string1, $string2) {
    $words1 = $string1.Split(" ")
    $words2 = $string2.Split(" ")
    $longestWord = ""

    foreach ($word in $words1 + $words2) {
        if ($word.Length -gt $longestWord.Length) {
            $longestWord = $word
        }
    }

    return $longestWord
}
```

This function takes two input parameters `$string1` and `$string2`, splits them into words using the `Split` method and assigns the resulting arrays to the variables `$words1` and `$words2`. The function then initializes an empty string variable `$longestWord` to store the longest word.

The `foreach` loop iterates over all words in both arrays by concatenating them with the `+` operator. For each word, the loop checks if its length is greater than the length of the current longest word. If it is, the loop assigns the current word to the `$longestWord` variable.

After all words have been processed, the `return` statement outputs the value of `$longestWord`.

You can call this function like this: `Get-LongestWord "The quick brown fox" "jumps over"` and it will return `"jumps"`.