Complex sentence: Through a friend, Dr. Charles Warren (Nicholas Pryor), who is the curator of the Thorn Museum, Richard is introduced to journalist Joan Hart (Elizabeth Shephard), who was a colleague of Keith Jennings (David Warner) from the previous film.
Split into simpler sentences: Through a friend, Dr. Charles Warren (Nicholas Pryor), who is the curator of the Thorn Museum, Richard is introduced to journalist Joan Hart (Elizabeth Shephard). She was a colleague of Keith Jennings (David Warner) from the previous film.