Complex sentence: The depth of advance was twice that of 10 August but battalion frontages had been reduced from to compensate and an intermediate objective was selected for a pause of when the battalions in support would leapfrog the leading battalions and advance to the final objective.
Split into simpler sentences: The depth of advance was twice that of 10 August but battalion frontages had been reduced from to compensate. An intermediate objective was selected for a pause of when the battalions in support would leapfrog the leading battalions and advance to the final objective.