Complex sentence: An Honorary Associate of the National Secular Society, he called the Catholic Church "corrupt and riddled with corruption" with a history of operating outside the law dating back to the time of Thomas Becket, the recent Catholic sex abuse cases are one manifestation of this.
Split into simpler sentences: An Honorary Associate of the National Secular Society, he called the Catholic Church "corrupt and riddled with corruption". Starkey maintains the Roman Catholic Church has a history of operating outside the law dating back to the time of Thomas Becket and the recent Catholic sex abuse cases are one manifestation of this.