What are the description and credit of the course which the student whose last name is Smithson took?
return students ;return last names of #1 ;return #1 where #2 is  Smithson ;return course #3 took ;return description of #4 ;return credit of #4 ;return #5 ,  #6
['select', 'project', 'comparative', 'project', 'project', 'project', 'union']