Complex sentence: Within a week, the British 11th Hussars (Prince Albert's Own) had seized Fort Capuzzo and at an ambush east of Bardia, the British captured the 10th Army Engineer-in-Chief, General Lastucci.
Split into simpler sentences: Within a week, the British 11th Hussars (Prince Albert's Own) had seized Fort Capuzzo. In an ambush east of Bardia, the British captured the 10th Army Engineer-in-Chief, General Lastucci.