Complex sentence: The event points that Harold Harefoot, as a son and successor to Cnut, had fained the support of Anglo-Danish nobility, which violently rejected the claims of Ælfred, Edward, and (by extension) the Aethelings.
Split into simpler sentences: The event points that Harold Harefoot, as a son and successor to Cnut, had fained the support of Anglo-Danish nobility. Which violently rejected the claims of Ælfred, Edward, and (by extension) the Aethelings.