Complex sentence: Along with Kevin E. Abrams, Lively co-authored the book "The Pink Swastika", which states in the preface that "homosexuals (are) the true inventors of Nazism and the guiding force behind many Nazi atrocities".
Split into simpler sentences: Along with Kevin E. Abrams, Lively co-authored the book "The Pink Swastika". Abrams and Livey state in the preface that "homosexuals (are) the true inventors of Nazism and the guiding force behind many Nazi atrocities".