Complex sentence: The Salafi movement or Salafist movement or Salafism is an ultra-conservative reform movement within Sunni Islam that emerged in the second half of the 19th-century and advocated a return to the traditions of the "devout ancestors" (the salaf).
Split into simpler sentences: The Salafi movement or Salafist movement or Salafism is an ultra-conservative reform movement within Sunni Islam that emerged in the second half of the 19th-century. It advocated a return to the traditions of the "devout ancestors" (the salaf).