Flatbread is brittle and breaks easily as you already know.
The object of the packaging is to get the flatbread to you in good condition. If the packaging had enough space to allow you remove one piece undamaged, it would be loose enough for the pieces knock against each other in transit and break. Most likely, experience has shown "sacrifice" packaging is optimal insofar as the product is concerned.
Sacrifice packaging is bad news as far as you're concerned because it is engineered to preserve the product by "sacrificing" the container. You are working at cross-purposes with the manufacturer.
To make matters worse, Cellophane is used which is biodegradable but it becomes increasingly brittle as it ages.
• You could try to pull one from the centre with a pair of thin tweezers or tiny tongs while vibrating the package. The vibrations may allow you to slide the first one free.
• You could try to crack one slice into pieces with a knife. That might let you get the rest of the slices free remaining intact.
• You could try first pulling two-or-three at a time by gripping the edges and, if successful, replace the ones you don't want back into the package.
• You might have to bite the bullet (so to speak) and try carefully opening the package from the end and folding it closed afterward.
• Lastly, you may have little choice but to reuse the whole cardboard container to hold the rest of the torn package you are using day-to-day. Failing that, you might have to cave-in and go with another kind of reusable container.