Complex sentence: Janet Fielding (Tegan Jovanka), Nyssa (Sarah Sutton), Adric (Matthew Waterhouse) is killed-off in "Earthshock" a rare instance in the series in which a companion dies.
Split into simpler sentences: Janet Fielding (Tegan Jovanka), Nyssa (Sarah Sutton), Adric (Matthew Waterhouse) were his companions. Adric is killed-off in "Earthshock" a rare instance in the series in which a companion dies.