L>опечатка, неужели не видно ?

SELECT 
  T1.ID,
  T1.id1,
  T1.id2,
  T2_1.Description, 
  T2_2.Description
FROM (Table1 AS T1 
  INNER JOIN Table2 AS T2_1 ON T1.id1 = T2_1.ID) 
  INNER JOIN Table2 AS T2_2 ON T1.id2 = T2_2.ID;