Complex sentence: KaiC encodes for the KaiC protein which interacts with the KaiA and KaiB proteins in a post-translational oscillator (PTO) that is controlled by sequences of phosphorylation of KaiC protein.
Split into simpler sentences: KaiC encodes for the KaiC protein which interacts with the KaiA and KaiB proteins in a post-translational oscillator (PTO). The PTO is controlled by sequences of phosphorylation of KaiC protein.