Complex sentence: Crews reported rocket salvos in an area of 1.5 to two miles in diameter over central London which were repeated at four-minute intervals but only the Hyde Park battery was in a position to disrupt the bomb run.
Split into simpler sentences: Crews reported rocket salvos in an area of 1.5 to two miles in diameter which were repeated at four-minute intervals. Only the Hyde Park battery was in a position to disrupt the bomb run.