Complex sentence: Once the process is complete the "Lasius niger" worker emerges from the cocoon, at this stage "Lasius niger" is completely white but will darken over the course of an hour until it has turned black.
Split into simpler sentences: Once the process is complete the "Lasius niger" worker emerges from the cocoon. At this stage "Lasius niger" is completely white but will darken over the course of an hour until it has turned black.