Complex sentence: The method works by introducing a repressible "Dominant Lethal" gene into the insects, this gene kills the insects but it can be repressed by an external additive, this allows the insects to be reared in manufacturing facilities.
Split into simpler sentences: The method works by introducing a repressible "Dominant Lethal" gene into the insects. This gene kills the insects but it can be repressed by an external additive, which allows the insects to be reared in manufacturing facilities.