def simple_tokenizer(text: str) -> list[list[str]]:
    """
    Given whitespace/newline tokenized text, return the
    list of sentences (where each sentence is made of tokens)
    using whitespaces and newlines
    """

    doc: list[list[str]] = []
    if text:
        for s in text.split("\n"):
            doc.append(s.split(" "))

    return doc