Complex sentence: Two-thirds of the British force is estimated to have been killed or wounded.Most of those killed were hit in the initial firing as afterwards, the IRA men could find no direct ield of fire into the troops who were hidden under the train.
Split into simpler sentences: Two-thirds of the British force is estimated to have been killed or wounded. Afterwards, the IRA gunmen had no direct field of fire into the troops who were hidden under the train.