Complex sentence: In the next Sannidhanam, Lord Mahavishnu's sculpture is in sleeping position, the position which is called in Tamil' Ari thuyil', sleeping with a sense of knowing what is going on at present.
Split into simpler sentences: In the next Sannidhanam, Lord Mahavishnu is sculpture in sleeping position, the position which is called in Tamil'Ari thuyil'. The meaning is, sleeping with a sense of knowing what is going on at present.