Complex sentence: He had difficulties finding a supervisor for his final thesis: finally, only one professor, Lorenzo Mossa, offered to step in, assigning him to work on the legal conflict between Ottoman, Jewish and English law in Mandatory Palestine.
Split into simpler sentences: He had difficulties finding a supervisor for his final thesis. Only one professor, Lorenzo Mossa, finally offered to step in, and assigned him to work on the legal conflict between Ottoman, Jewish and English law in Mandatory Palestine.