sql server - FirstName, LastName in SQL, too complex? -

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This SQL looks complicated, is there an easy way to get the first name when one or both fields can be taped ? 

  SELECT COALESCE (last name, '') + case when last name + is not the first name then ',' end + COALESCE (first name, '') AS person by name About  
  SELECT COALESCE (LastName + ')      
 
 If the  first name  or  last name  is not complete, then complete the first name, '+ FirstName, LastName, FirstName' Expression (, ) becomes redundant, compelling the collages to check, second,  last name  alone, and If  Last Name  is zero, finally,  firstname  alone.

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