Complex sentence: The phosphate build-up theory is said to explain the myriad symptoms present in fibromyalgia and provides an underlying cause, but remains theoretical; there is no clinical evidence that the phosphate build-up theory is correct, or that Guaifenesin protocol is effective.
Split into simpler sentences: The phosphate build-up theory is said to explain the myriad symptoms present in fibromyalgia and provides an underlying cause, but remains strictly theoretical. There is no conclusive evidence that the phosphate build-up theory is correct, or that Guaifenesin protocol is effective.