Complex sentence: Infantry in the Ottoman 53rd Division which had been garrisoning Jaffa were ordered to move down the coast towards Gaza while Kress von Kressenstein moved his headquarters from Beersheba to Tell esh Sheria.
Split into simpler sentences: Infantry in the Ottoman 53rd Division which had been garrisoning Jaffa were ordered to march to Gaza. Meanwhile Kress von Kressenstein moved his headquarters from Beersheba to Tell esh Sheria.