分かりやすいうえに面白い

「〜うえに」 means 'on top of ~' or 'in addition to ~'. It's used to add another characteristic or condition to something that already has a primary characteristic. It often emphasizes that both aspects are present, making the overall impression stronger, usually positive.

「〜うえに」は「〜だけでなく、さらに」という意味。良い点や悪い点を重ねて言う時に使う。