Complex sentence: He started studying filmmaking at the ProDeo University in Rome, with professors such as Jean-Luc Godard, who let him work as second-assistant director to Academy Winner Russian director Sergei Bondarchuk for the 1970 film Waterloo.
Split into simpler sentences: He started studying filmmaking at the ProDeo University in Rome. His first professional work was as second-assistant director to Academy Winner Russian director Sergei Bondarchuk for the 1970 film Waterloo.