What are the names of projects that require more than 300 hours, and how many scientists are assigned to each?
return projects ;return hours #1 require ;return #1 where #2 is  higher than 300 ;return names of  #3 ;return scientists assigned to #3 ;return number of  #5 for each  #3 ;return #4 ,  #6
['select', 'project', 'comparative', 'project', 'project', 'group', 'union']