Complex sentence: As well as teaching at the Courtauld Institute, Read was Deputy Witt Librarian there until 1990, when he was appointed Senior Lecturer in Art History at the University of Leeds.
Split into simpler sentences: As well as teaching at the Courtauld Institute, Read was Deputy Witt Librarian there until 1990. In 1990 Read was appointed Senior Lecturer in Art History at the University of Leeds.