Complex sentence: She worked as a journalist and screenwriter, and since 1941 as independent author in the field of hermetic philosophy; sometimes she wrote under the pseudonyms "Mária Papir" and "Mária Orsi".
Split into simpler sentences: She worked as a journalist and screenwriter, as well as an independent author in the field of hermetic philosophy since 1941. She would sometimes write under the pseudonyms "Mária Papir" or "Mária Orsi".