Complex sentence: Kurds and Assyrians were prepared to move against the Ottomans, whenever the support from Erekle II arrived, but Russian General Totleben changed his mind and turned his detachment back to Kartli.
Split into simpler sentences: Kurds and Assyrians were prepared to move against the Ottomans, whenever the support from Erekle II arrived. But Russian General Totleben changed his mind and turned his detachment back to Kartli.