Complex sentence: After brigade headquarters was captured the regiment set off to join the 7th Indian Infantry Brigade at Sidi Omar Nuovo, moving to Bir Zemla to cut Bardia's communications from the west on 1--3 December.
Split into simpler sentences: After brigade headquarters was captured, the regiment set off to join the 7th Indian Infantry Brigade at Sidi Omar Nuovo. The regiment moved to Bir Zemla to cut Bardia's communications from the west on 1--3 December.