Task: Question Generation
Input (English): #1 return the  halfhearted reconquest  attemp 
#2 return the  fully-fledged reconquest  campaign on Navarre 
#3 return year of #1 
#4 return year of #2 
#5 return difference of #4 and  #3
Output (English): How many years passed between the halfhearted reconquest attemp and the fully-fledged reconquest campaign on Navarre?