Original: In 1976, he obtained his PhD with a thesis on the relationship between the Slovenian Christian Socialist movement and the Communist Party of Slovenia within the Liberation Front of the Slovenian People, which was still a controversial topic at the time.
Simplified: He obtained his PhD in 1976 with thesis on the relationship between the Slovenian Christian Socialist movement and the Communist Party of Slovenia within the Liberation Front of the Slovenian People, which at the time was a somehow problematic topic.