Complex sentence: At supper on the 23rd he received definite information of an impending attack on the morrow: the Scots were said to be fourteen, or even twenty, thousand strong, while Wharton could only muster a few hundreds.
Split into simpler sentences: At supper on the 23rd he received definite information of an attack impending on the morrow. The Scots were said to be fourteen, or even twenty, thousand strong, while Wharton could only muster a few hundreds.