Tools and techniques for untangling monster views (nested views)
You can enumerate nested views through this query:
SELECT DISTINCT
    sd.referenced_major_id,
    OBJECT_NAME(sd.referenced_major_id) as This_view,
    sd.object_id,
    OBJECT_NAME(sd.object_id) as need_this_view_to_work

FROM
    sys.sql_dependencies sd
WHERE 
    EXISTS (SELECT 1 FROM sys.views v WHERE sd.object_id = v.object_id)
    AND EXISTS (SELECT 1 FROM sys.views v WHERE sd.referenced_major_id = v.object_id);