Before revision: A sentence attempting to explain why opium induces sleep (or the same, why opium has soporific quality) , would be the following one: A less obvious example from Fallacies and Pitfalls of Language: The Language Trap by S. Morris Engel: This form of the fallacy may not be immediately obvious.
After revision: A sentence that explains why opium induces sleep (or the same, why opium has soporific quality) could be the following one: A less obvious example from Fallacies and Pitfalls of Language: The Language Trap by S. Morris Engel: This form of the fallacy may not be immediately obvious.