Complex sentence: This step was both difficult and painful and complete removal could not always be achieved and iofendylate's persistence in the body might sometimes lead to arachnoiditis, a potentially painful and debilitating life-long disorder of the spine.
Split into simpler sentences: This step was both difficult and painful and complete removal could not always be achieved. Unfortunately, iofendylate's persistence in the body might sometimes lead to arachnoiditis, a potentially painful and debilitating life-long disorder of the spine.