Complex sentence: The Anglo-Saxons knew themselves as the "Angelcynn", "Englisc" or "Engle", originally names of the "Angles", that came to refer to Saxons, Jutes and Frisii alike, at least in English.
Split into simpler sentences: The Anglo-Saxons knew themselves as the "Angelcynn", "Englisc" or "Engle". These names were originally names of the "Angles", but came to be used to refer to Saxons, Jutes and Frisii alike, at least in English.