Complex sentence: The enzyme in less available to certain areas in the body, like the bones, lungs, brain; so many symptoms of lysosomal storage diseases, especially neurological symptoms, remain untreated by ERT (9).
Split into simpler sentences: The enzyme in less available to certain areas in the body, like the bones, lungs, brain. For this reason, many symptoms of lysosomal storage diseases remain untreated by ERT, especially neurological symptoms (9).