Complex sentence: Following this action, the 88th Division then took part in the opening stages of Plan Blue, the German summer offensive, but after only a short advance was again on the defensive on the northern flank of the 9th Army, where it remained for several months.
Split into simpler sentences: Following this action, the 88th Division then took part in the opening stages of Plan Blue, the German summer offensive. After only a short advance, the division was again put on the defensive on the northern flank of the 9th Army, where it remained for several months.