Task: Question Generation
Input (English): #1 return the  region became a British protectorate 
#2 return it was  named Nyasaland 
#3 return when  was  #1 
#4 return when  was  #2 
#5 return difference of #4 and  #3 in  years
Output (English): How many years after the region became a British protectorate was it named Nyasaland?