Complex sentence: In order to perform darshan and puja, one has to climb on a stone slab and different parts of the Vishnu's idol, namely, the face, the navel and the feet, are visible from three different door like openings.
Split into simpler sentences: In order to perform darshan and puja, one has to climb on a stone slab. Different parts of Vishnu's idol--the face, the navel and the feet--are visible from three different door like openings.