Complex sentence: On 25 May 1917, "Kagohl" 3 sent 23 Gothas for a daylight raid on London but two were forced to turn back over the North Sea due to mechanical difficulties.
Split into simpler sentences: On 25 May 1917, "Kagohl" 3 sent 23 Gothas on a daylight raid on London. Two were forced to turn back over the North Sea due to mechanical difficulties.