Is this a run-on sentence?
In 1960, American pilot Francis Gary Powers was shot down and captured by the Soviets as he flew over the Ural Mountains on an intelligence mission for the CIA, nearly two years later, Powers was released in exchange for Rudolf Abel, a KGB spy who had been caught in the United States.
A. no
B. yes
Select the correct answer from the provided options and reply with the letter associated with it.

B