Complex sentence: His most famous writings are the novels "Groapa" (1957) and "Principle" (1969); Călin Barbu also wrote several film scripts, Călin some of which were for films starring his wife (Florin Piersic's "Mărgelatu" series).
Split into simpler sentences: His most famous writings are the novels "Groapa" (1957) and "Principle" (1969). Iliescu some of which were for films starring his wife (Florin Piersic's "Mărgelatu" series).