Task: Question Decomposition
Input (English): question: How many years passed between the region being annexed by the Kingdom of Prusia and it becoming part of the German Empire?
Output (English): #1 return the  region being annexed by the   Kingdom of Prusia 
#2 return the  region becoming part of the   German Empire 
#3 return year of #1 
#4 return year of #2 
#5 return the  difference of #4 and  #3