Complex sentence: Initially enraged, and after slaughtering five commuters, she was pacified by the Doctor and eventually overcame her race's hatred of humans to become a part of London society and a consulting detective to Scotland Yard and a possible inspiration for the Sherlock Holmes stories.
Split into simpler sentences: Initially enraged, and after slaughtering five commuters, she was pacified by the Doctor. She became a consulting detective to Scotland Yard, and a possible inspiration for the Sherlock Holmes stories.