Complex sentence: Opponents of this view argue that graphing calculators are more reliable because they last longer and that they also use less energy allowing them to use alkaline batteries which are far cheaper than the lithium ion-batteries that PDA and other devices typically use.
Split into simpler sentences: Opponents of this view argue that graphing calculators are more reliable because they last longer. They also argue that graphing calculators also use less energy, allowing them to be powered by alkaline batteries which are far cheaper than the lithium-ion batteries that PDA and other devices typically use.