Complex sentence: The king travelled the country, and has been argued to have originated the practice of raising money by giving remissions for serious crimes, and that some of the unpopular policies of James III originated in the late 1450s.
Split into simpler sentences: The king travelled the country and has been argued to have originated the practice of raising money by giving remissions for serious crimes. It has also been argued that some of the unpopular policies of James III originated in the late 1450s.