Complex sentence: In March 1918 the municipal city was merged into the Krasnodar Krai Police, and during the Russian civil war the city has been under multiple hands, including the White monarchist and finally the Red Army.
Split into simpler sentences: In March 1918, the municipal city was merged into the Krasnodar Krai Police. During the Russian civil war, the city was headed by several different groups including the White monarchists and finally the Red Army.