Complex sentence: A nurse at the hospital, which has an adoptive sister who doesn't know that she is adopted, therefore giving Hirasaka the chance to blackmail Hikaru Kodama into having sex with him, later on she keeps being raped by Hirasaka, but starts to like it.
Split into simpler sentences: A nurse at the hospital, who has an adoptive sister who doesn't know that she is adopted, giving Hirasaka the chance to blackmail Hikaru into having sex with him. Later on she keeps being raped by Hirasaka, but starts to like it.