Complex sentence: The focus of the controversy is the 1998 peer reviewed mathematical study that scrutinized data from every research study (based on written college student responses to earlier child sexual abuse (CSA)) that was cataloged in the USA between 1956 and 1995 inclusive.
Split into simpler sentences: The focus of the controversy is the 1998 peer reviewed research paper on child sexual abuse (CSA). The mathematical study scrutinized data from every research study based on written college student responses to child sexual abuse (CSA) that was cataloged in the USA between 1956 and 1995 inclusive.