Complex sentence: We now know, however, that while everybody avoids anxiety, some people go to much greater lengths than others to do so, and these are the individuals at risk for panic attacks, post-traumatic stress disorder, and phobias.
Split into simpler sentences: We now know, however, that while everybody avoids anxiety, some people go to much greater lengths than others to do so. These individuals are at risk for panic attacks, post-traumatic stress disorder, and phobias.