Original sentence: Hirschfeld developed a system which identified 64 actual or hypothetical types of sexual intermediary, and is credited with identifying a group of people that today are referred to as transsexual or transgender as separate from the categories of homosexuality, he referred to these people as 'transvestiten' (transvestites)
Edited sentence: Hirschfeld developed a system which identified numerous actual or hypothetical types of sexual intermediary between heterosexual male and female to represent the potential diversity of human sexuality, and is credited with identifying a group of people that today are referred to as transsexual or transgender as separate from the categories of homosexuality, he referred to these people as 'transvestiten' (transvestites)