Simplify the following text for a Grade 10 native English-speaking person.
Original: It hung in the ambassadorâ s residential office in Moscow , and intercepted confidential conversations there during the first seven years of the Cold War , until it was accidentally discovered in 1952 .
Simplified: It hung in the ambassadorâ s Moscow office until 1952 , when the bug was discovered by a British radio operator who heard conversations on an open radio channel .