Complex sentence: Lenin called his New Economic Policy (NEP) of 1921 "state capitalism" because it explicitly bowed to foreign investment by bankers and industrialists--the bankers and industrialists who had bankrolled him in the first place.
Split into simpler sentences: Lenin called his New Economic Policy (NEP) of 1921, state capitalism. Because it explicitly bowed to foreign investment by bankers and industrialists--the bankers and industrialists that had bankrolled him in the first place.