Complex sentence: In "Clock" mutant mice, they reported depressed levels of orexin, a neuropeptide involved in regulation of eating which provided further evidence that the "clock" gene has a profound impact on metabolic processes in mice.
Split into simpler sentences: In "Clock" mutant mice, they reported depressed levels of orexin, a neuropeptide involved in regulation of eating. This result provides further evidence that the "clock" gene has a profound impact on metabolic processes in mice.