Complex sentence: She was working as an assistant to Prof. L'vov teaching the first courses in Stereochemistry Her renown as a lecturer and her knowledge of teaching enabled her to write her first book which dealt with basic chemistry.
Split into simpler sentences: She was working as an assistant to Prof. L'vov teaching the first courses in Stereochemistry. Her reputation as a lecturer and her knowledge of teaching enabled her to write her first book which dealt with basic chemistry.