Benjamin- a View Header is editable to say anything you want, but is not intended to wrap to more than one line. You could choose to reveal the View Footer, which can be text as as long as you like and will wrap, so you can use the View Footer to supply additional detail about the View. Alternatively, you can add a thin Content View above the View in question and write anything, with formatting and dynamic displays...this can be used to put lengthy text above a View, if you really must.

Remember that there are also Titles (above) and Annotation fields (below) available to span text across all the Views on any given tab.