Original sentence: NASA eventually decided to use the smaller solid rocket boosters due to their lower development costs.The final design would be a winged orbiter with three liquid fueled engines, a large expendable external tank which held liquid propellant for these engines, and two reusable solid rocket boosters.While the liquid-fueled systems provided better performance and enhanced safety, delivery capability to orbit is more a function of the upper-stage performance and weight than the lower; the money was hence spent elsewhere
Edited sentence: NASA eventually decided to use the smaller solid rocket boosters, due to their lower development costs.The final design which was selected was a winged orbiter with three liquid fueled engines, a large expendable external tank which held liquid propellant for these engines, and two reusable solid rocket boosters.While the liquid-fueled systems provided better performance and enhanced safety, delivery capability to orbit is more a function of the upper-stage performance and weight than the lower; the money was therefore spent elsewhere