Complex sentence: The commanding officer and sixty-five men who were to establish the Main Dressing Station (MDS) travelled in the same aircraft as brigade headquarters, while Nos 1,2 and 3 Sections were attached to the 1st Canadian, 8th and 9th parachute battalions.
Split into simpler sentences: The commanding officer and sixty-five men who were to establish the Main Dressing Station (MDS) travelled in the same aircraft as brigade headquarters. While Nos 1,2 and 3 Sections were attached to the 1st Canadian, 8th and 9th parachute battalions.