Complex sentence: By the end of the 19th century the term was being used by New Thought authors such as Prentice Mulford and Ralph Trine, but for them the law of attraction not only affected health but every other aspect of our lives.
Split into simpler sentences: By the end of the 19th century the term ´ Law of attraction ´ had been coined and was being written about by many New Thought authors. To them the law of attraction not only affected health but every other aspect of our lives.