Complex sentence: In about 1947, McCabe charged the "Encyclopædia Britannica" with bias towards the Catholic Church, claiming that the 14th edition, published in 1929, had been stripped of content critical of the church, which had been in the 11th edition.
Split into simpler sentences: In about 1947, McCabe accused the "Encyclopædia Britannica" of bias towards the Catholic Church. He claimed that the 14th edition, which had been published in 1929, was devoid of the critical comment about the church that had been in the 11th edition.