How many months after the Republic of Venice besieged Sinj did they do it again?
return the  Republic of Venice besieged Sinj ;return the  Republic of Venice besieged Sinj again ;return when  was  #1 ;return when  was  #2 ;return difference of #3 and  #4 in  months
['select', 'select', 'project', 'project', 'arithmetic']