These use only a fraction of the energy of an ordinary light bulb, and although they are much more expensive to buy, they last eight times longer and will save you money because of reduced running costs.
(These; use; only a fraction of the energy of an ordinary light bulb) (they; are; much more expensive to buy) (they; to buy; ) (they; longer will save; you; money; because of reduced running costs)
These they they they
use are to buy longer will save
only a fraction of the energy of an ordinary light bulb
much more expensive to buy
you money because of reduced running costs