<prompt> unaweza kugeuza matini haya ya swahilikwa kiingereza?machar analiongoza kundi la upinzani ndani ya chama cha sudan peoples liberation movement-splm na kundi hilo linaonekana kuwa lenye upinzani mkubwa kwa rais kiir.  <response>: machar leads a dissident group within south sudans ruling party - the sudan peoples liberation movement splm - and is seen as the main challenger to kiir. 