Complex sentence: By 19 June British Second Army reported that no apparent damage had been caused to monuments in their area, however as the campaign proceeded so did the levels of damage; by mid-July across Normandy three monuments had been destroyed, 16 damaged and seven seriously.
Split into simpler sentences: By 19 June British Second Army reported that no apparent damage had been caused to monuments in their area. However, as the campaign proceeded so did the levels of damage; by mid-July across Normandy three monuments had been destroyed, 16 damaged and seven seriously.