<input id="someID" type="text" class="form-control" value="some text that is too long for my input width">
Are you looking for a new input field? If that is the case you count the characters passed and add another input field if character count > whatever you define. If you are looking to make the input field multi-line - my understanding is that you need to use a textarea instead.
<textarea>This is where you put the text.</textarea>
You can also look at the following if you want it to be auto-resized: Creating a textarea with auto-resize