Task: Question Decomposition
Input (English): question: What is the name of the customer who has greatest total loan amount?
Output (English): #1 return customers 
#2 return loans of  #1 
#3 return amounts of  #2 
#4 return sum of  #3 for each  #1 
#5 return #1 where #4 is  highest 
#6 return name of  #5