Complex sentence: Bandler and Grinder claimed that in addition to being a therapeutic method, NLP was also a study of communication and began marketing it as a business tool, claiming that, "if any human being can do anything, so can you".
Split into simpler sentences: Bandler and Grinder claimed that in addition to being a therapeutic method, NLP was also a study of communication. Grinder and Bandler began marketing it as a business tool, claiming that, "if any human being can do anything, so can you".