Complex sentence: The nerve cells that signal pain are individual structures with fibers that reach from the locations in the lower back where pain is sensed to the spinal cord; the body of the cell is located in the dorsal root ganglia.
Split into simpler sentences: The nerve cells that signal pain are individual structures with fibers that reach from the locations in the lower back where pain is sensed to the spinal cord. The body of each cell is located in the dorsal root ganglia.