Complex sentence: Medtronic is the only company with the technology in spinal cord stimulation that is safe for patients to undergo a MRI, however, the Medtronic equipment is sometimes combined with other brands of equipment and can therefore still make MRI unsafe.
Split into simpler sentences: Medtronic is the only company with the technology in spinal cord stimulation that is safe for patients to undergo a MRI. However, the Medtronic equipment is sometimes combined with other brands of equipment and can therefore still make MRI unsafe.