Complex sentence: In this regard, commencing in late May, drafts of men were farewelled from the battalion in order of their arrival at the battalion, and this included the commanding officer, Lieutenant Colonel Arapeta Awatere, who was replaced by Lieutenant Colonel James Henare.
Split into simpler sentences: In this regard, commencing in late May, drafts of men departed in the order of their arrival at the battalion. This included the commanding officer, Lieutenant Colonel Arapeta Awatere, who was replaced by Lieutenant Colonel James Henare.