Complex sentence: Davidson, 194 The Viet Minh elite 148th Independent Infantry Regiment, headquartered at Điện Biên Phủ, reacted "instantly and effectively"; three of their four battalions, however, were absent that day.
Split into simpler sentences: Davidson, 194 The Viet Minh elite 148th Independent Infantry Regiment, headquartered at Điện Biên Phủ, reacted "instantly and effectively". Three of their four battalions, however, were absent that day.