What is the version of the following sentence with correct punctuation?

1980s1990s Two decades in which the DPRK saw how two of its main allies changed their policies towards North Korea Kim Il Sung passed away and Kim Jong Il came to power
1980s-1990s - Two decades in which the DPRK saw how two of its main allies changed their policies towards North Korea, Kim Il Sung passed away and Kim Jong Il came to power.