Complex sentence: Molotov quickly warns Grigor of this bold move against him, and Grigor is able to mobilize support from many of the paramilitary Black Robe troops in Moscow and he shuts down the coup, killing the rebel officers.
Split into simpler sentences: Molotov quickly warns Grigor of this bold move against him, and Grigor is able to mobilize support from many of the paramilitary Black Robe troops in Moscow. Grigor shuts down the coup, killing the rebel officers.