Show the role description and the id of the project staff involved in most number of project outcomes?
return project  staff ;return projects of  #1 ;return outcomes of  #2 ;return number of  #3 for each  #1 ;return #1 where #4 is  highest ;return role description of  #5 ;return id of  #5 ;return #6 ,  #7
['select', 'project', 'project', 'group', 'superlative', 'project', 'project', 'union']