Complex sentence: In front of the sanctum is an "antarala" with two small shrines within which are facing images of Ganesha and Parvati, in her Durga aspect as Mahishasuramardini killing the buffalo demon.
Split into simpler sentences: In front of the sanctum is an "antarala" with two small shrines. Therein are Ganesha and Parvati in her Durga aspect as Mahishasuramardini killing the buffalo demon.