Complex sentence: Today, many of the authors'scientific conclusions are indeed thought to have been mistaken-for example they claimed that bran (roughage) had many negative impacts on the intestine, which contradicts today's view that bran in moderation is beneficial to the intestines.
Split into simpler sentences: Today, many of the authors'scientific conclusions are indeed thought to have been mistaken. For example, they claimed that bran (roughage) has many negative effects on the intestine, which contradicts today's view that bran in moderation is beneficial to the intestines.