Task: Question Decomposition
Input (English): question: How many years after the invasion forces disembarked the USS Montana did the occupation end?
Output (English): #1 return the  invasion forces disembarked the   USS Montana 
#2 return the  occupation did end 
#3 return year of #1 
#4 return year of #2 
#5 return difference of #4 and  #3