Complex sentence: Due to differing social norms, the content of these comics sometimes ran afoul of Canadian customs officials, however--especially incidental nudity which could be interpreted by them as child pornography and result in jail terms.
Split into simpler sentences: Due to differing social norms, the content of these comics are sometimes censored or ran afoul of Canadian customs officials. Incidental nudity could be interpreted by them as child pornography and result in jail terms.