Complex sentence: As well as co-ordinating the publication of the four volumes of the'Popular History', Waite wrote the first volume, an account of the NZEF campaign in Gallipoli, Waite having served there with the New Zealand Engineers.
Split into simpler sentences: As well as co-ordinating the publication of the four volumes of the'Popular History', Waite took on the writing of the first of the series. This was an account of the NZEF campaign in Gallipoli of which Waite had firsthand experience, having served there with the New Zealand Engineers.