Complex sentence: In local terms at least, the Blitz was over and apart from some token raids designed to create the pretence of ongoing strategic bombing, the night fighters guarding the ports of the Humber Estuary were left short of targets.
Split into simpler sentences: In local terms at least, the Blitz was over. Apart from some token raids probably designed to create the pretence of ongoing strategic bombing, the night fighters guarding the ports of the Humber Estuary were left short of targets.