Complex sentence: On 3/13 November the invasion fleet entered the English Channel through the Strait of Dover in an enormous square formation, 25 ships deep, the right and left of the fleet saluting Dover and Calais simultaneously, to show off its size.
Split into simpler sentences: On 3/13 November the invasion fleet entered the English Channel through the Strait of Dover in an enormous square formation, 25 ships deep. The right and left of the fleet saluted Dover and Calais simultaneously, to show off its size.