Does this sentence make any sense and is it accurate?

The Soviet Union, however, rejected the
Marshall Plan due to the belief that they could not keep a
close eye on the satellite states in the Eastern bloc and that the West was trying to enforce their democratic ideas.

++++

If it is not accurate, then why did the Soviet Union rejected the Marshall Plan?

The statement is pretty accurate. The Soviet union also had no desire to see West Germany recover economically. In East Germany, they enforced war reparations and deported many able-bodied males to labor camps in places like Kazakhstan, where they remained for many years. The Soviet Union was itself a war-devastated country and was unable economically to aid other war-torn European countries that had not been enemies. In Stalin's view, it needed its resources to recover and occupy the Iron Curtain countries.

Thank you very much!

You're welcome! I'm glad I could help. If you have any more questions, feel free to ask!