Task: Question Decomposition
Input (English): question: find travel arrangements for a round trip flight from boston to pittsburgh arriving after 8pm 
Output (English): #1 return flights 
#2 return round trip #1 
#3 return #2 from  boston 
#4 return #3 to pittsburgh 
#5 return #4 arriving after 8pm 
#6 return travel arrangements for #5