Complex sentence: When the Germans slipped through, the Rhodesians were pulled back to a position between the two towns, and instructed to defend either one as circumstances dictated, but the Germans did not launch an attack, instead setting up camp in their own territory at Galula.
Split into simpler sentences: When the Germans slipped through, the Rhodesians were pulled back to a position between the two towns and instructed to defend either one as circumstances dictated. The Germans did not launch an attack, however, instead setting up camp in their own territory at Galula.