Complex sentence: Shortly afterwards he was seconded from operations to the RCAF's Overseas Headquarters for staff duties, then served a short term with No.6 Group before once more taking command of No.405 Squadron in February, 1942.
Split into simpler sentences: Shortly afterwards he was transferred from operations to the RCAF's Overseas Headquarters for staff duties. He then served a short term with No.6 Group before once more taking command of No.405 Squadron in February, 1942.