Complex sentence: He received his degrees from the University of Zagreb (a bachelors degree in economics and a masters degree in marketing) and was a lecturer in marketing and management in postgraduate studies at the Faculty of Economics of the University of Zagreb.
Split into simpler sentences: He received his degrees from the University of Zagreb (a bachelors degree in economics and a masters degree in marketing). He was a lecturer in marketing and management in postgraduate studies at the Faculty of Economics of the University of Zagreb.