Complex sentence: Umarov agreed and appointed Astemirov head of the Caucasian insurgency's Sharia Court instead of Mansur Yelmurzaev, a Chechen Islamic scholar who was against the Emirate idea and urged saving Ichkeria as a symbol of the Caucasian resistance.
Split into simpler sentences: Umarov agreed and appointed Astemirov head of the Caucasian insurgency's Sharia Courts. His predecessor Mansur Yelmurzaev was releived from this position because he was opposed to the creation of an Emirate and urged saving Ichkeria as a symbol of the Caucasian resistance.