Complex sentence: The bombing attack south-east from the wood could not begin but on the left flank, the Londoners got into the front line and advanced close to Middle Copse; the tank had driven to the end of Bouleaux Wood and then ditched.
Split into simpler sentences: The bombing attack south-east from the wood could not begin but on the left flank, the Londoners got into the front line and got close to Middle Copse. The tank had driven to the end of Bouleaux Wood and then ditched.