Complex sentence: Newton, for his part, creates a device that allows him to drift with a Kaiju's brain fragment, and discovers that the Kaiju are bioweapons created by extraterrestrial colonists to wipe out humanity and invade Earth.
Split into simpler sentences: Newton, for his part, creates a device that allows him to drift with a Kaiju brain. He drifts with a brain fragment and discovers that the Kaiju are bioweapons created by extraterrestrial colonists to wipe out humanity and invade Earth.