Complex sentence: There were an estimated 500 such establishments, that included a large number of homosexual venues for men and for lesbians; sometimes transvestites of one or both genders were admitted, otherwise there were at least 5 known establishments that were exclusively for a transvestite clientele.
Split into simpler sentences: There were an estimated 500 such establishments, that included a large number of homosexual venues for men and for lesbians. Sometimes transvestites of one or both genders were admitted, otherwise there were at least 5 known establishments that were exclusively for a transvestite clientele.