Complex sentence: The Sole Survivor kills Kellogg, avenging their spouse's murder, retrieves a cybernetic implant from his brain and heads to Goodneighbor to seek help from Doctor Amari, a scientist skilled in neuroscience, to access the dead mercenary's memories.
Split into simpler sentences: The Sole Survivor kills Kellogg, avenging their spouse's murder. Thet retrieve a cybernetic implant from Kellogg's brain and head to Goodneighbor to seek help from Doctor Amari, a scientist skilled in neuroscience who helps access the dead mercenary's memories.