Complex sentence: Zeebrugge was visible to the fleet and the fleet to the Germans in Zeebrugge; seventy-seven ships of all sizes, some with their lights already switched off, had to make a sharp turn to the west to return to their bases.
Split into simpler sentences: Zeebrugge was visible to the fleet and the fleet to the Germans in Zeebrugge. Seventy-seven ships of all sizes, some with their lights already switched off, had to make a sharp turn to the west to return to their bases.