Complex sentence: Her most famous role however is as the vampire Carmilla/Mircalla in Hammer's "Lust for a Vampire" being the sequel to "The Vampire Lovers" starring Ingrid Pitt as Mircalla.
Split into simpler sentences: Her most famous role is that of the vampire Carmilla/Mircalla in Hammer's "Lust for a Vampire". The film was the sequel to "The Vampire Lovers" which had starred Ingrid Pitt as Mircalla.