Complex sentence: While Gram staining is a valuable diagnostic tool in both clinical and research settings, not all bacteria can be definitively classified by this technique, thus forming "Gram-variable" and "Gram-indeterminate" groups as well.
Split into simpler sentences: While Gram staining is a valuable diagnostic tool in both clinical and research settings, not all bacteria can be definitively classified by this technique. This gives rise to "Gram-variable" and "Gram-indeterminate" groups as well.