Complex sentence: In order to find out how to get into the KGB, Putin visited the KGB Directorate's office in St Petersburg, where he was told that they only take people with higher education or who have finished military service.
Split into simpler sentences: In order to find out how to get into the KGB, Putin visited the agency's office in St Petersburg. There, he was told that the KGB would only hire people with higher education or who have finished military service.