Simplify the following text for a Grade 10 native English-speaking person.
Original: NFG could thereby purchase huge quantities of cheaper summer gas from the southwest , pipe it to its New York storage fields , inject it into the ground , then retrieve it when demand and prices rose in the winter months .
Simplified: NFG could then buy huge amounts of cheaper summer gas from the southwest , pipe it to the New York storage fields , pump it down into the ground , then take it back out when demand and prices went up in the winter months .