Complex sentence: The "Anglo-Saxon Chronicle" ignores the existence of Svein, or his claim to the throne, which Howard considers as evidence of the relative entries being unreliable, of failing to give a complete picture.
Split into simpler sentences: The "Anglo-Saxon Chronicle" ignores the existence of Svein, or his claim to the throne. Which Howard considers as evidence of the relative entries being unreliable, of failing to give a complete picture.