Complex sentence: Because of the cult of the Sun, the Bulgars had preference for the south, and their main buildings like shrines faced south, as well their yurts were usually entered from the south, or less often from the east.
Split into simpler sentences: Because of the cult of the Sun, the Bulgars had a preference for the south. Their main buildings and shrines faced south, as well their yurts, which were usually entered from the south, although less often from the east.