Complex sentence: By this stage bomb weight had increased, with 500kg bombs in common use--on 1 August another raid centred on the eastern docks killed 24 people at Grindell street when a 1800kg bomb was dropped on it.
Split into simpler sentences: By this stage bomb weight had increased, with 500kg bombs in common use. On 1 August another raid centred on the eastern docks killed 24 people at Grindell street when a 1800kg bomb was dropped on it.