Complex sentence: Within the crime case files as well as journalistic accounts the killer was known as "The Whitechapel Murderer" and "Leather Apron," the latter nickname referring to John Pizer, a thief who targeted prostitutes in the East End of London.
Split into simpler sentences: Within the crime case files as well as journalistic accounts the killer was known as "The Whitechapel Murderer" as well as "Leather Apron". The latter nickname referred to John Pizer, a thief who targeted prostitutes in the East End of London.