unfortunately HTML doesn't allow you to make an input multi-line but you can use a textarea instead. (See the code snippet below)
I've set "rows" to 2 since you mentioned you wanted it to take 2 lines instead of just 1, you can change that to be whatever number of lines you want.
<form action="/form/submit" method="post">
<label for="text">Description:</label>
<br>
<textarea id="text" name="text" rows="2" cols="50"></textarea>
<br/>
<input type="submit" value="Submit">
</form>
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